I'd like to add informations on the Thank you page that provide from my external server. For example a link to an invoice that I generate on my webserver.
Is it possible to do that : a call to an external php script on my webserver, that will return some text information that can be show on the Thank you page ?
I think that if it's possible, it's by creating an app, but I can find information about it in the documentation.
Thanks for your help