WP Simple Pay: Translate Stripe Error Messages

/**

 * @link https://library.wpcode.com/snippet/rov9rl2l/

 */

add_filter(

	'simpay_get_localized_error_list',

	/**

	 * @param array $messages Stripe error messages. Keyed by error code.

 	 * @return array

 	 */

	function( $messages ) {

		// https://stripe.com/docs/error-codes#coupon-expired

		$messages['coupon_expired'] = 'The coupon has expired and is no longer valid';

		return $messages;

	}

);