instagram webhook setup?

Question

PHP

I set up Instagram webhooks on my personal server https://onlinemanagement.ru/webhooks


When sending a test message, the server does not accept webhooks with error 400



I've already gone through a million documentation, I don't understand what the problem is

Answer 1

Because the options are called hub.challenge, not hub_challenge; hub.verify_token, not hub_verify_token.
Upd: as we found out, php forcefully changes the dot to an underscore. While discussing in the comments.