How does EDI to JSON translation work?

By appending an X3 or R5 filename to the request, you'll see the X12 EDI contents of the file:

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

Add the /835 suffix to the path, and the API translates the same content to a more-readable JSON:

https://apigw.changehealthcare.com/medicalnetwork/reports/v1/R5000000.XZ/835

{
    "transactions": [
        {
            "detailInfo": [
                {
                    "assignedNumber": "1",
                    "paymentInfo": [
                        {
                            "claimPaymentInfo": {
                                "claimFilingIndicatorCode": "12",
                                "claimFrequencyCode": "1",
                                "claimPaymentAmount": "500",
                                "claimStatusCode": "1",
                                "facilityTypeCode": "11",
                                "patientControlNumber": "5554555444",
                                "patientResponsibilityAmount": "300",
                                "payerClaimControlNumber": "94060555410000",
                                "totalClaimChargeAmount": "800"
                            },
                            "claimSupplementInformation":  
 (...)