Use the Async Partner API to provision changes

[jasonwalsh]

The add-on receives HTTP requests and invokes an Ansible Playbook with the data from the request. This type of request is costly and must be executed asynchronously.

After receiving a request, immediately respond with 202 Accepted as the Playbook executes as a separate process. After the Playbook finishes executing, issue a request to the Heroku callback API to configure environment variables for the application.

Refer to https://devcenter.heroku.com/articles/add-on-partner-technical-best-practices#don-t-perform-expensive-provisions-or-plan-changes-in-real-time for additional information.