This package is here to help you for the payments on Relief Applications' applications.
To install this package, just run :
composer req relief_applications/payment-handler-bundle
This will install the package into your vendors.
To use this package, create a method in a controller that will handle the request from the payment server. Then simply call the method :
$payload = SuccessfulPaymentHandler::getPayload($request);
This will verify that the data are coming from the payment server and will decrypt it so you can use the payload that was passed by the front of the application as an array.