Create RoR web app relay in Heroku. Post request to Post Request.

I need a small web app relay for post request from Moonclerk trigger creation of order, and all customer info (post request) into Brinng. Here is the developer info. [login to view URL] Bringg: [login to view URL] This web app will be ran in heroku. If you want to build this relay into Zapier as a app, this would work for me too.