JS or PHP - where to send POST and GET requests to the GetResponse API?

Question

PHP

I read the GetResponse API, but especially earlier in my small practice of web development I did not come across the work of APIs of third-party services and servers. If I want to send via API just an email of a user who is collected through a form on the site, make a cross-domain request through JS, or first send it to my server in php, and then from there a request to GetResponse?
I did not work with cross-domain requests in js and I assume there are some difficulties here.

Answer 1

This is your choice. If you need to save an email in your database, then send a request to your server, and from there, after saving, a request to a third-party API. Or you can send a request via ajax from js to yourself and a request to a third-party server... Do as it is easier for you if there is no difference.
PS But no one will dig out a request to a third-party server from php, at least unlike JS.