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# paymentAuthorizationViewController(_:didRequestMerchantSessionUpdate:)

Requests an object that validates the identity of a merchant for a payment request.

```
optional func paymentAuthorizationViewController(_ controller: PKPaymentAuthorizationViewController, didRequestMerchantSessionUpdate handler: @escaping @Sendable (PKPaymentRequestMerchantSessionUpdate) -> Void)
```

## Parameters

`controller`

The payment authorization view controller.

`handler`

The completion handler to call with the updated merchant session.

## Discussion

---

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