Execute slash command as slack bot

Solution 1:

Bots can use the undocumented API method chat.command to invoke slash commands.

See here for an unofficial documentation page of this API method.

This question was also answered here.

The command chat.command needs the permission scope post, which only legacy tokens have and which is not available for Slack apps.

I just asked the Slack customer support if sending slash commands programmatically is still possible and received the following reply:

I'm afraid not. Slash commands can only be triggered by human-sent messages from the client. Apologies.