How can I interact with a third party service that sends POST requests to me in response to the order information that I send them?

Since I doubt “pretty” URLs are important here, it’s incredibly easy to create an endpoint/handler using the AJAX api (the other option is to use the rewrite API and listen out for a hit). Don’t be put off by the term “AJAX” – this is simply a script within your WordPress install that will fire … Read more