"Protect Content Plugin" IPN-interface specification

Hello! I would like to connect the Protect Content Plugin with the german Marketplace DigiStore24.com . They (DigiStore24) say this can be done easily through their "generic and easy to use HTTP-interface"... Now I am not a Coder, and I tried to summ this up in this Job description: https://premium.wpmudev.org/jobs/ipn-interface-integrate-protect-content-plugin-with-payment-platform-digistore24/

As I wrote there, DigiStore24 has a lot of documentation on how to interface with them:
IPN-interface documentation: https://www.digistore24.com/download/ipn/examples/ipn/digistore_ipn.pdf
Download PHP script example:
Test IPN-connection:
About the Digistore24 API:

I posted this also on a german platform, now some developers ask me to give some specification on the Protect Content Plugin. I am not a Coder, so I would like to ask you for help. Could anyone of the Plugin developers share some information about my coding request? From what you can understand from my post, is it easily possible to connect the Plugin with DigiStore24?

Is there any useful information that I could share with the developers, before assigning the job?

Thanks a lot in advance for your support here! :slight_smile: