REST API - Is there a SIMPLE way to post an Order ID?

Hi @Randall_Weisheit, from the API perspective you may have some luck using REST Hooks. You would need to set up an endpoint on your side that can accept the incoming REST Hook request, and then add a REST Hook subscription via this endpoint. You will receive a POST to your specified endpoint each time an order is created if you were to subscribe to the order.add event. For the full list of event types, see this post.