I built a microservice that does something similar[0] for Mailchimp. They have an API that requires a secret key, but we didn't want to keep a server running for it (and obviously didn't want anyone on the internet playing with our key). So I set up a little python service that serves a page and 'proxies' the API to the end user.
[0] https://github.com/sasha42/Mailchimp-utility