Use class as integration key.

Author: remcotolsma

pronamic-pay-with-mollie-for-gravity-forms.php

@@ -60,7 +60,11 @@ function( $modules ) {
 add_filter(
 	'pronamic_pay_plugin_integrations',
 	function( $integrations ) {
-		$integrations[] = new \Pronamic\WordPress\Pay\Extensions\GravityForms\Extension();
+		$class = \Pronamic\WordPress\Pay\Extensions\GravityForms\Extension::class;
+
+		if ( ! array_key_exists( $class, $integrations ) ) {
+			$integrations[ $class ] = new $class();
+		}
 
 		return $integrations;
 	}