Create my WHMCS intégration

Hello,

I would like to create a custom integration for Zammad with WHMCS.
For this I thought to do an integration like the one for Slack but no documentation is present.
Do you have more information on integration models, their location in files, etc?

Thank you in advance.

Maybe these links will help something

https://community.zammad.org/t/automating-creation-of-custom-object-attributes/3831/2

https://community.zammad.org/t/examples-of-zpm-files/2881/2