在routes.rb中访问POST参数

I have a system with a web UI that works as normal, and an API endpoint at /receiver_api. Users send emails which are parsed by Mailgun, who then submit a POST to this endpoint. There are a lot of possible actions that we may want to take, depending on the values of these params (create new post, create new reply, add subscription, delete subscription etc.), and when writing the handler it felt like we were doing a kind of routing again!I have a system with a web UI that works as nor