ContactlessPaymentSession

Constructor to initialize ContactlessPaymentSession.

Request authorization from user to allow NFC usage.

This prompts the permission dialog during first time application launch. On subsequent call, this API check the current authorization granted by end user.

When end user allows the authorization, the application is shown in list of default contactless application. Otherwise, application is not shown in the list.

Throws:

• nfcPermissionNotAccepted - user does not allow the authorization.
• systemEligibilityFailed - Device not eligible for contactless payment.
• unknown(_:) - Unknown error encountered during transaction.

Start the card emulation and presents a modal user interface to user.

This API is available after authenticationCompleted. Developer could call this API on authenticationCompleted or posConnected, depending on the user experience preferred. After this API is called, a modal user presentation is shown, i.e. no further UI modification, except the setAlertMessage(_:).

Throws:

• deviceEnvironmentUnsafe(_:) if device environment is unsafe.
• unknown(_:) if error on starting card emulation.

Start contactless payment transaction.

The digital card ID provided will be remained as default card at the end of the payment

Application should call eventStream to handle each event.

Cancel ongoing contactless payment transaction.

An asynchronous sequence of events from contactless payment transaction.

A message to show on the NFC action sheet.

Application should set the message for following events:

• authenticationCompleted - start of transaction.
• posConnected - device is tapped to NFC reader.
• posDisconnected - device is disconnected from NFC reader.

The device eligibility whether it supports contactless payment.

Errors encounterd for contactless payment session.

Events produced during contactless payment session.

Struct to manage the authentication flow.