You can set your webhook URL using GET request(i.e. even opening in browser will work) below:

https://api.telegram.org/bot<token>/setWebhook?url=<url>

For example, if your webhook URL is htps://website.dev/myHook and API token is 12345:AAsecret_token,

https://api.telegram.org/bot12345:AAsecret_token/setWebhook?url=htps://website.dev/myHook

{"ok":true,"result":true,"description":"Webhook was set"} will be returned from telegram API upon successful change.

This way there's no need to send message to FatherBot.