How do I test my application ?

Hi everyone. I am developing an api where I want to receive feed updates from a Facebook page. I created the backend and configured it with the webhook pages, when I click on the test button of the feed, green check its shown and "The sample update was successfully sent to your server." text its display, but no request is sent; When I click on the send_cart test button I receive a request on my backend (this is only for test reasons, I am not interested receive send_cart requests). I'm not sure if it's some issue with the feed test button. If anyone has an idea how to solve this or knows how to make test requests for the feed in another way, it would be very helpful to me. PD: The url on my backend for the test its a POST url.