Submit a Da Vinci PAS prior authorization request bundle and handle the full response lifecycle including pend polling

Steps

1. Reference the current published PAS IG (v2.1.0 is the current published STU 2 at hl7.org/fhir/us/davinci-pas; v2.2.1 is in active development on the CI build) — use whichever version your payer's endpoint declares in its CapabilityStatement.
2. Build a PAS Bundle conforming to the PASRequestBundle profile: include a Claim resource (using the PAS Claim profile), the referenced ServiceRequest, Coverage, Patient, Practitioner, and Organization resources as Bundle entries.
3. POST the bundle to the payer's FHIR $submit operation endpoint; a synchronous ClaimResponse is returned — check ClaimResponse.outcome: complete/approved, partial, queued (pended), or error.
4. For a queued response, extract the payer-assigned claim identifier from ClaimResponse.identifier and use it to poll the payer's $inquire operation on a schedule until a final decision is returned or the regulatory decision window expires.
5. Map ClaimResponse.item.adjudication to prior authorization status, approved quantity/units, and authorization number; store the authorization number for attachment to the downstream 837 claim.
6. Test the integration against the Da Vinci PAS Inferno test kit at inferno.healthit.gov/test-kits/davinci-pas to verify bundle structure, response handling, and error scenarios.