@Tsvetan Tsakov if you look in your Trello settings, does that API token still have access to your account?
If so you should be able to fetch a list of all your webhooks valid for that token:
https://developers.trello.com/reference/#tokenstokenwebhooks
If the webhooks exist, what I would recommend is checking that the posts are making it to your server.
If they're not possible problems may be to do with either DNS or SSL, have you confirmed that the same URL you're using with Trello's webhooks are working in other situations for example in your web browser or as a webhook with another service such as Zapier?
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