Never tested with selfhosted ntfy.sh. Is the webhook url enough for authentication? It contains some secret info at least for cloud version.

I tried to add username and password to the url but that didn't work. If you have authentication enabled for ntfy.sh it is just a basic authentication.

The curl example works fine to send notifications.

curl -u user:password -d "Backup successful 😀" myinstance.whatever/mytopic

You may test with cloud ntfy.sh to see how to generate an authentication url. I guess self-hosted version will have same thing.

perfect, got it working now. Thanks