AcceptStripePayments_payment_completed does not work?

I’m testing this hook using a 100% value coupon and hook is not called.

my code in functions.php:

function my_custom_payment_completed_action( $payment_id, $amount ) {
    var_dump($payment_id);
    wp_die();
}
add_action( 'AcceptStripePayments_payment_completed', 'my_custom_payment_completed_action', 10, 2 )