Automate CURL after Payment

[Zazu]

Hello,

I have a website-builder solution. This would be manage with an API (Create new user, ...).
So it would be nice, if I would be able to sell this also with whmcs.

Example statement:
curl -X POST  --header 'Authorization: {user}:{Password}' --header 'Content-Type: application/x-www-form-urlencoded' --header 'Accept: application/json' -d 'forename=Heinz ...' '{URL-to-API}';

Do you have an idea, how to integrate the API in WHMCS?
Which module do I have to setup on product settings (auto release)?

Thank you!