What does a typical Reports API request and response look like?

The core request does not send a request body, and simply queries for the entire contents of the customer's mailbox:

https://apigw.changehealthcare.com/medicalnetwork/reports/v1

The API returns a complete listing of all documents available to a customer:

{
    "reports": [
        "X3000000.XX",
        "R5000000.XY",
        "R5000000.XX",
        "X3000000.AB",
        "X3000000.AC",
        "X3000000.ZZ",
        "R5000000.XZ",
        "R5000000.YZ",
        "R5000000.WA",
        "R5000000.WB"
        ...
    ]
}

By appending the X3 or R5 filename to the request, you'll see the X12 EDI contents of the file (the following is an example; your documents will show different information):

https://apigw.changehealthcare.com/medicalnetwork/reports/v1/R5000000.XZ