Hello! I'm trying to figure out a way to send alerts to a channel via API. I was able to authenticate to the API using credentials from a Server-Server OAuth app however I'm now reading that only user accounts can send messages (using /im/me/chat/messages/Send IM messages ) and I can't grant this app access to send messages. Is there any other way to automate sending messages to a channel or person? I've read some about chatbots but I'm also not trying to sign up for a bunch of third party stuff and worry about confidentiality. 

Thanks!

when I use the API to create a meeting I receive this error:  {“code”:1001,“message”:“User does not exist: *******”} the procedure is correct, because with another of our accounts it works fine. But only with one, in the other four that we have it gives the indicated error. I also tried to replace the email with the account ID but it still doesn't find it. Can you tell me if I need to configure something myself or if there is a system update problem? I would like to point out that the problem occurred after the migration from the old jwt authentication system to the new OAuth