How to retrieve PAR (Payment Account Reference) with Fiserv for Clover card-present payments (Dev Kit / Sandbox vs Production)

[tusharlink]

We are integrating Clover Mini (production) for card-present payments and need PAR (Payment Account Reference) to run third-party loyalty checks.

Our current flow:

1. Start payment on Clover with orderId + externalReferenceId
2. Clover returns payment result including paymentId
3. Backend needs to retrieve PAR for that payment from Fiserv

We couldn't find documentation that explains the official supported integration between Clover and Fiserv to retrieve PAR for Clover card-present transactions.

We also tried CommerceHub POST /payments/v1/transaction-inquiry, but we only have Clover identifiers (paymentId, orderId, externalReferenceId) and don't see how to map them to a Fiserv/CommerceHub transaction reference to fetch PAR.

Question: What is the official supported way to integrate Clover and Fiserv to obtain PAR for a Clover card-present payment (which API/endpoint and which field), and does it work in production vs sandbox?

Thank You,
Tushar