bookingpress_{payment_gateway}_submit_form_data

    add_filter('bookingpress_{payment_gateway}_submit_form_data', 'bookingpress_{payment_gateway}_submit_form_data_func', 10, 2);
    //{payment_gateway} is dynamic text, it replaces actual payment gateway slug like (paypal, stripe)
    function bookingpress_{payment_gateway}_submit_form_data_func($response, $bookingpress_return_data)
    {
        //$response response data array from payment gateway
        //$bookingpress_return_data

        return $response;
    }