Test buttons in the Apiway interface only check the ability to connect to applications.

To test the integration itself, you need to send a test lead or test data to the Trigger app (the app that is a source of data you need to transfer from) and check if your test lead or test data was transferred through the integration to the Action app (the app that will be the data recipient).

For example, Facebook provides an official Lead Ads Testing Tool that you can use for this: https://developers.facebook.com/tools/lead-ads-testing

For other apps, you need to create and send test leads or test data manually.