see madaritech#7: add a filter to allow 3rd parties to manipulate the…

… merge variables before the request is sent to MailChimp

admin/class-sincro-mailchimp-admin.php

@@ -450,7 +450,24 @@ public function subscribe_user( $user_email, $smc ) {
 
  foreach ( $smc as $list_id => $interests ) {
  $args['interests'] = $interests;
- $add_status = $this->add_list_member( $list_id, $args );
+
+ /**
+ * Call the `sm_merge_fields` filter to allow 3rd parties to preprocess the `merge_fields` before the
+ * request to MailChimp.
+ *
+ * @since 1.0.0
+ *
+ * @api
+ *
+ * @param array array() An empty array of merge fields.
+ * @param string $user_email The user's e-mail address.
+ * @param string $list_id The MailChimp list's id.
+ * @param array $interests An array of interests' ids.
+ * @param array $smc The Sincro_Mailchimp configuration's array.
+ */
+ $args['merge_fields'] = apply_filters( 'sm_merge_fields', array(), $user_email, $list_id, $interests, $smc );
+
+ $add_status = $this->add_list_member( $list_id, $args );
 
  if ( Sincro_MailChimp_Log_Service::is_enabled() ) {
  $this->log->trace( "Call to `add_list_member` returned [ " . var_export( $add_status, true ) . " ]" );

includes/class-sincro-mailchimp-log-service.php

@@ -104,7 +104,7 @@ public function trace( $message ) {
  $this->log( 'TRACE', $message );
 
  }
- 
+
  /**
  * Internal log function.
  *