Thanks Andy! Sorry for being mean i think i was a bit far off.
Anyway, you are right. I need to encode the URL.
Now it says this but i feel i can request it myself
Setting a webhook configuration...
POST ERROR occurred with /1.1/account_activity/all/devel/webhooks.json?url=https%3A%2F%2Fmn.taqisystems.com%2Ftwitter%2Fwebhook, request:
Error code: 403 #<Net::HTTPForbidden:0x00007f97f49f98c0>
Error Message: {"errors":[{"code":261,"message":"Application cannot perform write actions. Contact Twitter Platform Operations through https://help.twitter.com/forms/platform."}]}
{"code"=>261, "message"=>"Application cannot perform write actions. Contact Twitter Platform Operations through https://help.twitter.com/forms/platform."}
Sorry again and thank you! 