* Check if a given request has access to update an item.
	 *
	 * @since 1.0.0-beta.1
	 * @since 1.0.0-beta.10 Handle the `trigger` param.
	 *
	 * @param  WP_REST_Request $request Full details about the request.
	 * @return WP_Error|boolean
	 */
	public function update_item_permissions_check( $request ) {

		$enrollment_exists = $this->enrollment_exists( (int) $request['id'], (int) $request['post_id'], $request['trigger'] );
		if ( is_wp_error( $enrollment_exists ) ) {
			return $enrollment_exists;
		}