It is not possible to order a labcorp test via API. Our lab endpoints are typically for lab vendors who would like to connect to a drchrono account. In that sense, it is not possible to send any orders to labs directly.
Yes, that is our only documentation and our older one here:
https://app.drchrono.com/api-docs-old/v4/documentation# I am in the process of creating documentation that will supplement our API docs, once completed I am looking to attach it to our API documentation.
Let me know if you have any further questions.