fix Getting and setting current user from pr #2

Author: menno-ll

src/Factories/Coupon.php

@@ -77,11 +77,11 @@ public function get_object_by_id( $object_id ) {
 	}
 
 	private function api_call_setup() {
-		$this->old_user = wp_get_current_user();
+		$this->old_user = get_current_user_id();
 
 		// Setup the administrator user so we can actually retrieve the order.
 		$user = new \WP_User( 1 );
-		wp_set_current_user( $user );
+		wp_set_current_user( $user->ID );
 	}