---
title: "paymentAuthorizationViewController(_:didRequestMerchantSessionUpdate:)"
framework: passkit
role: symbol
role_heading: Instance Method
path: "passkit/pkpaymentauthorizationviewcontrollerdelegate/paymentauthorizationviewcontroller(_:didrequestmerchantsessionupdate:)"
---

# paymentAuthorizationViewController(_:didRequestMerchantSessionUpdate:)

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

## Declaration

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

```swift
optional func paymentAuthorizationViewControllerDidRequestMerchantSessionUpdate(controller: PKPaymentAuthorizationViewController) async -> PKPaymentRequestMerchantSessionUpdate
```

## Parameters

- `controller`: The payment authorization view controller.
- `handler`: The completion handler to call with the updated merchant session.

## See Also

### Handling user’s payment authorization

- [paymentAuthorizationViewControllerWillAuthorizePayment(_:)](passkit/pkpaymentauthorizationviewcontrollerdelegate/paymentauthorizationviewcontrollerwillauthorizepayment(_:).md)
- [paymentAuthorizationViewController(_:didAuthorizePayment:handler:)](passkit/pkpaymentauthorizationviewcontrollerdelegate/paymentauthorizationviewcontroller(_:didauthorizepayment:handler:).md)
- [paymentAuthorizationViewController(_:didAuthorizePayment:completion:)](passkit/pkpaymentauthorizationviewcontrollerdelegate/paymentauthorizationviewcontroller(_:didauthorizepayment:completion:).md)
- [paymentAuthorizationViewControllerDidFinish(_:)](passkit/pkpaymentauthorizationviewcontrollerdelegate/paymentauthorizationviewcontrollerdidfinish(_:).md)
- [paymentAuthorizationViewController(_:didSelect:handler:)](passkit/pkpaymentauthorizationviewcontrollerdelegate/paymentauthorizationviewcontroller(_:didselect:handler:)-3bex6.md)
- [paymentAuthorizationViewController(_:didSelect:completion:)](passkit/pkpaymentauthorizationviewcontrollerdelegate/paymentauthorizationviewcontroller(_:didselect:completion:)-30s85.md)