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<title>[2532] sites/trunk/wordcamp.org/public_html/wp-content/plugins: WordCamp Budgets Dashboard: Send Sponsor Invoices to QuickBooks.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="http://meta.trac.wordpress.org/changeset/2532">2532</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"http://meta.trac.wordpress.org/changeset/2532","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>iandunn</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2016-02-19 00:10:43 +0000 (Fri, 19 Feb 2016)</dd>
</dl>

<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>WordCamp Budgets Dashboard: Send Sponsor Invoices to QuickBooks.

This includes several interconnected pieces:
* Creating new Customers
* Fetching existing Customers
* Creating Invoices
* Sending Invoices</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcamppaymentsnetworkincludessponsorinvoicesdashboardphp">sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments-network/includes/sponsor-invoices-dashboard.php</a></li>
<li><a href="#sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcampqbowordcampqbophp">sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-qbo/wordcamp-qbo.php</a></li>
<li><a href="#sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcampqboclientwordcampqboclientphp">sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-qbo-client/wordcamp-qbo-client.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcamppaymentsnetworkincludessponsorinvoicesdashboardphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments-network/includes/sponsor-invoices-dashboard.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments-network/includes/sponsor-invoices-dashboard.php 2016-02-18 23:18:12 UTC (rev 2531)
+++ sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-payments-network/includes/sponsor-invoices-dashboard.php   2016-02-19 00:10:43 UTC (rev 2532)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -216,7 +216,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        switch_to_blog( $site_id );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $quickbooks_result = send_invoice_to_quickbooks( $site_id, $invoice_id );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $quickbooks_result = \WordCamp_QBO_Client::send_invoice_to_quickbooks( $invoice_id );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        if ( is_int( $quickbooks_result ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                update_post_meta( $invoice_id, '_wcbsi_qbo_invoice_id', absint( $quickbooks_result ) );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -238,50 +238,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * Send an invoice to the sponsor through QuickBooks Online's API
- *
- * @param int $site_id
- * @param int $invoice_id
- *
- * @return int|string
- */
-function send_invoice_to_quickbooks( $site_id, $invoice_id ) {
-       switch_to_blog( $site_id );
-
-       $invoice_meta = get_post_custom( $invoice_id );
-       $sponsor_meta = get_post_custom( $invoice_meta['_wcbsi_sponsor_id'][0] );
-
-       /* these are the values needed for the API call. they're guaranteed to exist.
-       wp_send_json_error( array(
-               $sponsor_meta['_wcpt_sponsor_company_name'][0],
-               $sponsor_meta['_wcpt_sponsor_first_name'][0],
-               $sponsor_meta['_wcpt_sponsor_last_name'][0],
-               $sponsor_meta['_wcpt_sponsor_email_address'][0],
-               $sponsor_meta['_wcpt_sponsor_phone_number'][0],
-
-               $sponsor_meta['_wcpt_sponsor_street_address1'][0],
-               $sponsor_meta['_wcpt_sponsor_street_address2'][0],
-               $sponsor_meta['_wcpt_sponsor_city'][0],
-               $sponsor_meta['_wcpt_sponsor_state'][0],
-               $sponsor_meta['_wcpt_sponsor_zip_code'][0],
-               $sponsor_meta['_wcpt_sponsor_country'][0],
-
-               $invoice_meta['_wcbsi_due_date'][0],
-               $invoice_meta['_wcbsi_description'][0],
-               $invoice_meta['_wcbsi_currency'][0],
-               $invoice_meta['_wcbsi_amount'][0],
-       ) );
-       */
-
-       $sent = 'QuickBooks integration is not complete yet.';
-       // todo return QBO invoice ID on success, or an error message string on failure
-
-       restore_current_blog();
-
-       return $sent;
-}
-
-/**
</del><span class="cx" style="display: block; padding: 0 10px">  * Send a request to QuickBooks to check if any sent invoices have been paid
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * If any have been, update the status of the local copy, and notify the organizer who sent the invoice.
</span></span></pre></div>
<a id="sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcampqbowordcampqbophp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-qbo/wordcamp-qbo.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-qbo/wordcamp-qbo.php     2016-02-18 23:18:12 UTC (rev 2531)
+++ sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-qbo/wordcamp-qbo.php       2016-02-19 00:10:43 UTC (rev 2532)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -83,6 +83,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        'methods' => 'GET',
</span><span class="cx" style="display: block; padding: 0 10px">                        'callback' => array( __CLASS__, 'rest_callback_classes' ),
</span><span class="cx" style="display: block; padding: 0 10px">                ) );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+               register_rest_route( 'wordcamp-qbo/v1', '/invoice', array(
+                       'methods' => 'GET, POST',
+                       'callback' => array( __CLASS__, 'rest_callback_invoice' ),
+               ) );
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -263,6 +268,571 @@
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * REST: /invoice
+        *
+        * Creates a new Invoice in QuickBooks and sends it to the Customer
+        *
+        * @param WP_REST_Request $request
+        *
+        * @return int|WP_Error The invoice ID on success, or a WP_Error on failure
+        */
+       public static function rest_callback_invoice( $request ) {
+               if ( ! self::_is_valid_request( $request ) ) {
+                       return new WP_Error( 'unauthorized', 'Unauthorized', array( 'status' => 401 ) );
+               }
+
+               $invoice_id = self::create_invoice(
+                       $request->get_param( 'sponsor'         ),
+                       $request->get_param( 'currency_code'   ),
+                       $request->get_param( 'qbo_class_id'    ),
+                       $request->get_param( 'invoice_title'   ),
+                       $request->get_param( 'amount'          ),
+                       $request->get_param( 'description'     ),
+                       $request->get_param( 'due_date'        ),
+                       $request->get_param( 'statement_memo'  )
+               );
+
+               if ( is_wp_error( $invoice_id ) ) {
+                       return $invoice_id;
+               }
+
+               /*
+                * @todo Sending invoices automatically is initially disabled so we can manually review them for accuracy
+               $invoice_sent = self::send_invoice( $invoice_id );
+
+               if ( is_wp_error( $invoice_sent ) ) {
+                       self::notify_invoice_failed_to_send( $invoice_id, $invoice_sent );
+               }
+               */
+
+               return $invoice_id;
+       }
+
+       /**
+        * Creates an Invoice in QuickBooks
+        *
+        * @param array  $sponsor
+        * @param string $currency_code
+        * @param int    $class_id
+        * @param string $invoice_title
+        * @param float  $amount
+        * @param string $description
+        * @param string $due_date
+        * @param string $statement_memo
+        *
+        * @return int|WP_Error Invoice ID on success; error on failure
+        */
+       protected static function create_invoice( $sponsor, $currency_code, $class_id, $invoice_title, $amount, $description, $due_date, $statement_memo ) {
+               $qbo_request = self::build_qbo_create_invoice_request(
+                       $sponsor,
+                       $currency_code,
+                       $class_id,
+                       $invoice_title,
+                       $amount,
+                       $description,
+                       $due_date,
+                       $sponsor['email-address'],
+                       $statement_memo
+               );
+
+               if ( is_wp_error( $qbo_request ) ) {
+                       return $qbo_request;
+               }
+
+               $response = wp_remote_post( $qbo_request['url'], $qbo_request['args'] );
+
+               if ( is_wp_error( $response ) ) {
+                       $result = $response;
+               } elseif ( 200 != wp_remote_retrieve_response_code( $response ) ) {
+                       $result = new WP_Error( 'invalid_http_code', 'Invalid HTTP response code', $response );
+               } else {
+                       $body = json_decode( wp_remote_retrieve_body( $response ), true );
+
+                       if ( isset( $body['Invoice']['Id'] ) ) {
+                               $result = absint( $body['Invoice']['Id'] );
+                       } else {
+                               $result = new WP_Error( 'empty_body', 'Could not decode invoice result.', $response );
+                       }
+               }
+
+               return $result;
+       }
+
+       /**
+        * Build the requset to create an invoice in QuickBooks
+        *
+        * @param array  $sponsor
+        * @param string $currency_code
+        * @param int    $class_id
+        * @param string $invoice_title
+        * @param float  $amount
+        * @param string $description
+        * @param string $due_date
+        * @param string $customer_email
+        * @param string $statement_memo
+        *
+        * @return array|WP_Error
+        */
+       protected static function build_qbo_create_invoice_request( $sponsor, $currency_code, $class_id, $invoice_title, $amount, $description, $due_date, $customer_email, $statement_memo ) {
+               $customer_id = self::probably_get_customer_id( $sponsor, $currency_code );
+
+               if ( is_wp_error( $customer_id ) ) {
+                       return $customer_id;
+               }
+
+               $class_id        = sanitize_text_field( $class_id        );
+               $invoice_title   = sanitize_text_field( $invoice_title   );
+               $amount          = floatval(            $amount          );
+               $description     = sanitize_text_field( $description     );
+               $due_date        = sanitize_text_field( $due_date        );
+               $statement_memo  = sanitize_text_field( $statement_memo  );
+
+               /*
+                * The currency code only needs to be sanitized, not validated, because QBO will reject the invoice if
+                * an invalid code is passed. We don't have to worry about an invoice being assigned the the home currency
+                * by accident.
+                */
+               $currency_code = sanitize_text_field( $currency_code );
+
+               /*
+                * QBO sandboxes will send invoices to whatever e-mail address you assign them, rather than sending them
+                * to the sandbox owner. So to avoid sending sandbox e-mails to real sponsor addresses, we use a fake
+                * address instead.
+                */
+               if ( self::$sandbox_mode ) {
+                       $customer_email = 'jane.doe@example.org';
+               } else {
+                       $customer_email = is_email( $customer_email );
+               }
+
+               foreach ( array( 'amount', 'due_date', 'customer_id', 'customer_email' ) as $field ) {
+                       if ( empty( $$field ) ) {
+                               return new WP_Error( 'required_field_empty', "$field cannot be empty." );
+                       }
+               }
+
+               self::load_options();
+               $oauth = self::_get_oauth();
+               $oauth->set_token( self::$options['auth']['oauth_token'], self::$options['auth']['oauth_token_secret'] );
+
+               $payment_instructions = str_replace( "\t", '', "
+                       Please remit checks to: WordPress Community Support, PBC, 3426 SE Kathryn Ct, Milwaukie, OR 97222
+
+                       For payments via ACH or international wire transfers:
+
+                       Bank Name: JPMorgan Chase Bank, N.A.
+                       Bank Address: 4 New York Plaza, Floor 15, New York, NY 10004, USA
+                       SWIFT/BIC: CHASUS33
+                       Bank Routing & Transit Number: 021000021
+                       Account Number: 791828879
+
+                       To pay via credit card: Please send the payment via PayPal to sponsor@wordcamp.org. An additional 3% on the payment to cover PayPal fees is highly appreciated."
+               );
+
+               $payload = array(
+                       'PrivateNote' => $statement_memo,
+
+                       'Line' => array(
+                               array(
+                                       'Amount'      => $amount,
+                                       'Description' => $invoice_title,
+                                       'DetailType'  => 'SalesItemLineDetail',
+
+                                       'SalesItemLineDetail' => array(
+                                               'ItemRef' => array(
+                                                       'value' => '20', // Sponsorship
+                                               ),
+
+                                               'ClassRef' => array(
+                                                       'value' => $class_id,
+                                               ),
+
+                                               'UnitPrice' => $amount,
+                                               'Qty'       => 1,
+                                       )
+                               )
+                       ),
+
+                       'CustomerRef' => array(
+                               'value' => $customer_id,
+                       ),
+
+                       // Note: the limit for this is 1,000 characters
+                       'CustomerMemo' => array(
+                               'value' => sprintf( "%s\n%s", $description, $payment_instructions ),
+                       ),
+
+                       'SalesTermRef' => array(
+                               'value' => 1, // Due on receipt
+                       ),
+
+                       'DueDate' => $due_date,
+
+                       'BillEmail' => array(
+                               'Address' => $customer_email,
+                       ),
+               );
+
+               /*
+                * QuickBooks doesn't have a CustomerCurrency row for the home currency, so a CurrencyRef is only used
+                * for foreign currencies.
+                *
+                * QBO will automatically activate a valid currency for our Company when we create an invoice using it
+                * for the first time, so we don't need any code to automatically activate them.
+                */
+               if ( 'USD' != $currency_code ) {
+                       $payload['CurrencyRef'] = array(
+                               'value' => $currency_code,
+                       );
+               }
+
+               $request_url = sprintf(
+                       '%s/v3/company/%d/invoice',
+                       self::$api_base_url,
+                       rawurlencode( self::$options['auth']['realmId'] )
+               );
+
+               $payload = wp_json_encode( $payload );
+
+               $args = array(
+                       'headers' => array(
+                               'Authorization' => $oauth->get_oauth_header( 'POST', $request_url, $payload ),
+                               'Accept'        => 'application/json',
+                               'Content-Type'  => 'application/json',
+                       ),
+                       'body' => $payload,
+               );
+
+               return array(
+                       'url'  => $request_url,
+                       'args' => $args
+               );
+       }
+
+       /**
+        * Email a QuickBooks invoice to the Customer
+        *
+        * @param int $invoice_id
+        *
+        * @return bool|WP_Error true on success; WP_Error on failure
+        */
+       protected static function send_invoice( $invoice_id ) {
+               $qbo_request = self::build_qbo_send_invoice_request( $invoice_id );
+               $response    = wp_remote_post( $qbo_request['url'], $qbo_request['args'] );
+
+               if ( is_wp_error( $response ) ) {
+                       $result = $response;
+               } elseif ( 200 != wp_remote_retrieve_response_code( $response ) ) {
+                       $result = new WP_Error( 'invalid_http_code', 'Invalid HTTP response code', $response );
+               } else {
+                       $body = json_decode( wp_remote_retrieve_body( $response ), true );
+
+                       if ( isset( $body['Invoice']['EmailStatus'] ) && 'EmailSent' === $body['Invoice']['EmailStatus'] ) {
+                               $result = true;
+                       } else {
+                               $result = new WP_Error( 'empty_body', 'Could not decode invoice result.', $response );
+                       }
+               }
+
+               return $result;
+       }
+
+       /**
+        * Build a request to send an Invoice via QuickBook's API
+        *
+        * @param int $invoice_id
+        *
+        * @return array
+        */
+       protected static function build_qbo_send_invoice_request( $invoice_id ) {
+               self::load_options();
+               $oauth = self::_get_oauth();
+               $oauth->set_token( self::$options['auth']['oauth_token'], self::$options['auth']['oauth_token_secret'] );
+
+               $request_url = sprintf(
+                       '%s/v3/company/%d/invoice/%s/send',
+                       self::$api_base_url,
+                       rawurlencode( self::$options['auth']['realmId'] ),
+                       rawurlencode( absint( $invoice_id ) )
+               );
+
+               $args = array(
+                       'headers' => array(
+                               'Authorization' => $oauth->get_oauth_header( 'POST', $request_url ),
+                               'Accept'        => 'application/json',
+                               'Content-Type'  => 'application/octet-stream',
+                       ),
+                       'body' => '',
+               );
+
+               return array(
+                       'url'  => $request_url,
+                       'args' => $args,
+               );
+       }
+
+       /**
+        * Notify Central that an invoice was created but couldn't be sent to the sponsor
+        *
+        * @param int      $invoice_id
+        * @param WP_Error $error
+        *
+        * @return bool
+        */
+       protected static function notify_invoice_failed_to_send( $invoice_id, $error ) {
+               $message = sprintf( "
+                       QuickBooks invoice $invoice_id was created, but an error occurred while trying to send it to the sponsor.
+
+                       This may be an indication of a bug on WordCamp.org, so please ask your friendly neighborhood developers to investigate.
+
+                       The invoice will probably need to be sent manually in QuickBooks, but let the developers investigate first, and then go from there.
+
+                       Debugging information for the developers:
+
+                       %s",
+                       print_r( $error, true )
+               );
+               $message = str_replace( "\t", '', $message );
+
+               return wp_mail( 'support@wordcamp.org', "QuickBooks invoice $invoice_id failed to send", $message );
+       }
+
+       /**
+        * Get a Customer ID, either by finding an existing one, or creating a new one
+        *
+        * @param string $sponsor
+        * @param string $currency_code
+        *
+        * @return int|WP_Error The customer ID if success; a WP_Error if failure
+        */
+       protected static function probably_get_customer_id( $sponsor, $currency_code ) {
+               $customer_id = self::get_customer( $sponsor['company-name'], $currency_code );
+
+               if ( is_wp_error( $customer_id ) || ! $customer_id ) {
+                       $customer_id = self::create_customer( $sponsor, $currency_code );
+               }
+
+               return $customer_id;
+       }
+
+       /**
+        * Fetch a Customer record from QBO
+        *
+        * @param string $customer_name
+        * @param string $currency_code
+        *
+        * @return int|false|WP_Error A customer ID as integer, if one was found; false if no match was found; a WP_Error if an error occurred.
+        */
+       protected static function get_customer( $customer_name, $currency_code ) {
+               $qbo_request = self::build_qbo_get_customer_request( $customer_name );
+
+               if ( is_wp_error( $qbo_request ) ) {
+                       return $qbo_request;
+               }
+
+               $response = wp_remote_get( $qbo_request['url'], $qbo_request['args'] );
+
+               if ( is_wp_error( $response ) ) {
+                       $result = $response;
+               } elseif ( 200 != wp_remote_retrieve_response_code( $response ) ) {
+                       $result = new WP_Error( 'invalid_http_code', 'Invalid HTTP response code', $response );
+               } else {
+                       $body = json_decode( wp_remote_retrieve_body( $response ), true );
+
+                       if ( isset( $body['QueryResponse']['Customer'][0]['Id'] ) ) {
+                               $result = self::pluck_customer_id_by_currency( $body['QueryResponse']['Customer'], $currency_code );
+                       } elseif ( isset( $body['QueryResponse'] ) && 0 === count( $body['QueryResponse'] ) ) {
+                               $result = false;
+                       } else {
+                               $result = new WP_Error( 'invalid_response_body', 'Could not extract information from response.', $response );
+                       }
+               }
+
+               return $result;
+       }
+
+       /**
+        * Build a request to fetch a Customer from QuickBook's API
+        *
+        * @param string $customer_name
+        *
+        * @return array|WP_Error
+        */
+       protected static function build_qbo_get_customer_request( $customer_name ) {
+               global $wpdb;
+
+               $customer_name = sanitize_text_field( $customer_name );
+
+               self::load_options();
+               $oauth = self::_get_oauth();
+               $oauth->set_token( self::$options['auth']['oauth_token'], self::$options['auth']['oauth_token_secret'] );
+
+               $request_url = sprintf(
+                       '%s/v3/company/%d/query',
+                       self::$api_base_url,
+                       rawurlencode( self::$options['auth']['realmId'] )
+               );
+
+               $request_url_query = array(
+                       'query' => $wpdb->prepare(
+                               "SELECT * FROM Customer WHERE CompanyName = '%s'",
+                               $customer_name
+                       ),
+               );
+
+               $args = array(
+                       'headers' => array(
+                               'Authorization' => $oauth->get_oauth_header( 'GET', $request_url, $request_url_query ),
+                               'Accept'        => 'application/json',
+                       ),
+               );
+
+               $request_url_query = array_map( 'rawurlencode', $request_url_query ); // has to be done after get_oauth_header(), or oauth_signature won't be generated correctly
+               $request_url       = add_query_arg( $request_url_query, $request_url );
+
+               return array(
+                       'url'  => $request_url,
+                       'args' => $args,
+               );
+       }
+
+       /**
+        * Pluck a Customer out of an array based on their currency
+        *
+        * QuickBook's API doesn't allow you to filter query results based on a CurrencyRef, so we have to do it
+        * manually.
+        *
+        * @param array  $customers
+        * @param string $currency_code
+        *
+        * @return int|false A customer ID on success, or false on failure
+        */
+       protected static function pluck_customer_id_by_currency( $customers, $currency_code ) {
+               $customer_id = false;
+
+               foreach ( $customers as $customer ) {
+                       if ( $customer['CurrencyRef']['value'] === $currency_code ) {
+                               $customer_id = absint( $customer['Id'] );
+                               break;
+                       }
+               }
+
+               return $customer_id;
+       }
+
+       /**
+        * Create a customer in QuickBooks for a corresponding Sponsor in WordCamp.org
+        *
+        * @param array  $sponsor
+        * @param string $currency_code
+        *
+        * @return int|WP_Error The customer ID if success; a WP_Error if failure
+        */
+       protected static function create_customer( $sponsor, $currency_code ) {
+               $qbo_request = self::build_qbo_create_customer_request( $sponsor, $currency_code );
+
+               if ( is_wp_error( $qbo_request ) ) {
+                       return $qbo_request;
+               }
+
+               $response = wp_remote_post( $qbo_request['url'], $qbo_request['args'] );
+
+               if ( is_wp_error( $response ) ) {
+                       $result = $response;
+               } elseif ( 200 != wp_remote_retrieve_response_code( $response ) ) {
+                       $result = new WP_Error( 'invalid_http_code', 'Invalid HTTP response code', $response );
+               } else {
+                       $body = json_decode( wp_remote_retrieve_body( $response ), true );
+
+                       if ( isset( $body['Customer']['Id'] ) ) {
+                               $result = absint( $body['Customer']['Id'] );
+                       } else {
+                               $result = new WP_Error( 'invalid_response_body', 'Could not extract customer ID from response.', $response );
+                       }
+               }
+
+               return $result;
+       }
+
+       /**
+        * Build a request to create a Customer via QuickBook's API
+        *
+        * @param array  $sponsor
+        * @param string $currency_code
+        *
+        * @return array|WP_Error
+        */
+       protected static function build_qbo_create_customer_request( $sponsor, $currency_code ) {
+               self::load_options();
+               $oauth = self::_get_oauth();
+               $oauth->set_token( self::$options['auth']['oauth_token'], self::$options['auth']['oauth_token_secret'] );
+
+               $sponsor                  = array_map( 'sanitize_text_field', $sponsor );
+               $sponsor['email-address'] = is_email( $sponsor['email-address'] );
+               $currency_code            = sanitize_text_field( $currency_code );
+
+               if ( empty( $sponsor['company-name'] ) || empty( $sponsor['email-address'] ) ) {
+                       return new WP_Error( 'required_fields_missing', 'Required fields are missing.', $sponsor );
+               }
+
+               $payload = array(
+                       'BillAddr' => array(
+                               'Line1'                  => $sponsor['address1'],
+                               'City'                   => $sponsor['city'],
+                               'Country'                => $sponsor['country'],
+                               'CountrySubDivisionCode' => $sponsor['state'],
+                               'PostalCode'             => $sponsor['zip-code'],
+                       ),
+
+                       'CurrencyRef' => array(
+                               'value' => $currency_code
+                       ),
+
+                       'PreferredDeliveryMethod' =>'Email',
+
+                       'GivenName'        => $sponsor['first-name'],
+                       'FamilyName'       => $sponsor['last-name'],
+                       'CompanyName'      => $sponsor['company-name'],
+                       'DisplayName'      => sprintf( '%s - %s', $sponsor['company-name'], $currency_code ),
+                       'PrintOnCheckName' => $sponsor['company-name'],
+
+                       'PrimaryPhone' => array(
+                               'FreeFormNumber' => $sponsor['phone-number'],
+                       ),
+
+                       'PrimaryEmailAddr' => array(
+                               'Address' => $sponsor['email-address'],
+                       ),
+               );
+
+               if ( isset( $sponsor['address2'] ) ) {
+                       $payload['BillAddr']['Line2'] = $sponsor['address2'];
+               }
+
+               $request_url = sprintf(
+                       '%s/v3/company/%d/customer',
+                       self::$api_base_url,
+                       rawurlencode( self::$options['auth']['realmId'] )
+               );
+
+               $payload = wp_json_encode( $payload );
+
+               $args = array(
+                       'headers' => array(
+                               'Authorization' => $oauth->get_oauth_header( 'POST', $request_url, $payload ),
+                               'Accept'        => 'application/json',
+                               'Content-Type'  => 'application/json',
+                       ),
+                       'body' => $payload,
+               );
+
+               return array(
+                       'url'  => $request_url,
+                       'args' => $args,
+               );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Verify an HMAC signature for an API request.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @param WP_REST_Request $request The REST API request.
</span></span></pre></div>
<a id="sitestrunkwordcamporgpublic_htmlwpcontentpluginswordcampqboclientwordcampqboclientphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-qbo-client/wordcamp-qbo-client.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-qbo-client/wordcamp-qbo-client.php       2016-02-18 23:18:12 UTC (rev 2531)
+++ sites/trunk/wordcamp.org/public_html/wp-content/plugins/wordcamp-qbo-client/wordcamp-qbo-client.php 2016-02-19 00:10:43 UTC (rev 2532)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -269,6 +269,101 @@
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * Send an invoice to the sponsor through QuickBooks Online's API
+        *
+        * @param int $invoice_id
+        *
+        * @return string
+        */
+       public static function send_invoice_to_quickbooks( $invoice_id ) {
+               $request  = self::build_send_invoice_request( $invoice_id );
+               $response = wp_remote_post( $request['url'], $request['args'] );
+
+               if ( is_wp_error( $response ) ) {
+                       $sent = $response->get_error_message();
+               } else {
+                       $body = json_decode( wp_remote_retrieve_body( $response ) );
+
+                       if ( is_numeric( $body ) ) {
+                               $sent = absint( $body );
+                       } elseif ( isset( $body->message ) ) {
+                               $sent = $body->message;
+                       } else {
+                               $sent = 'Unknown error.';
+                       }
+               }
+
+               return $sent;
+       }
+
+       /**
+        * Build a request for sending an invoice to QuickBooks
+        *
+        * @param int $invoice_id
+        *
+        * @return array
+        */
+       protected static function build_send_invoice_request( $invoice_id ) {
+               $invoice      = get_post( $invoice_id );
+               $invoice_meta = get_post_custom( $invoice_id );
+               $sponsor_meta = get_post_custom( $invoice_meta['_wcbsi_sponsor_id'][0] );
+
+               $due_date = new \DateTime(
+                       date( 'Y-m-d', $invoice_meta['_wcbsi_due_date'][0] ),
+                       new \DateTimeZone( get_option('timezone_string') )
+               );
+
+               $payload = array(
+                       'invoice_title'   => sanitize_text_field( $invoice->post_title                       ),
+                       'currency_code'   => sanitize_text_field( $invoice_meta['_wcbsi_currency'       ][0] ),
+                       'qbo_class_id'    => sanitize_text_field( $invoice_meta['_wcbsi_qbo_class_id'   ][0] ),
+                       'amount'          => floatval(            $invoice_meta['_wcbsi_amount'         ][0] ),
+                       'description'     => sanitize_text_field( $invoice_meta['_wcbsi_description'    ][0] ),
+                       'due_date'        => $due_date->format( 'Y-m-dP' ),
+
+                       'statement_memo' => sprintf(
+                               'WordCamp.org Invoice: %s',
+                               esc_url_raw( admin_url( sprintf( 'post.php?post=%s&action=edit', $invoice_id ) ) )
+                       ),
+
+                       'sponsor' => array(
+                               'company-name'  => sanitize_text_field( $sponsor_meta['_wcpt_sponsor_company_name' ][0] ),
+                               'first-name'    => sanitize_text_field( $sponsor_meta['_wcpt_sponsor_first_name'   ][0] ),
+                               'last-name'     => sanitize_text_field( $sponsor_meta['_wcpt_sponsor_last_name'    ][0] ),
+                               'email-address' => is_email(            $sponsor_meta['_wcpt_sponsor_email_address'][0] ),
+                               'phone-number'  => sanitize_text_field( $sponsor_meta['_wcpt_sponsor_phone_number' ][0] ),
+
+                               'address1' => sanitize_text_field( $sponsor_meta['_wcpt_sponsor_street_address1'][0] ),
+                               'city'     => sanitize_text_field( $sponsor_meta['_wcpt_sponsor_city'           ][0] ),
+                               'state'    => sanitize_text_field( $sponsor_meta['_wcpt_sponsor_state'          ][0] ),
+                               'zip-code' => sanitize_text_field( $sponsor_meta['_wcpt_sponsor_zip_code'       ][0] ),
+                               'country'  => sanitize_text_field( $sponsor_meta['_wcpt_sponsor_country'        ][0] ),
+                       )
+               );
+
+               if ( isset( $sponsor_meta['_wcpt_sponsor_street_address2'][0] ) ) {
+                       $payload['sponsor']['address2'] = sanitize_text_field( $sponsor_meta['_wcpt_sponsor_street_address2'][0] );
+               }
+
+               $request_url  = self::$api_base . '/invoice';
+               $body         = wp_json_encode( $payload );
+               $oauth_header = self::_get_auth_header( 'post', $request_url, $body );
+
+               $args = array(
+                       'headers' => array(
+                               'Authorization' => $oauth_header,
+                               'Content-Type'  => 'application/json',
+                       ),
+                       'body' => $body,
+               );
+
+               return array(
+                       'url'  => $request_url,
+                       'args' => $args,
+               );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Create an HMAC signature header for a request.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * Use with Authorization HTTP header.
</span></span></pre>
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