OrderIntentHandler-payment.swift

if fetchedPaymentToken == nil {
  let request = self.paymentRepository.createPKRequest(order: order)
  if self.paymentRepository.canSubmit(paymentRequest: request) {
    group.enter()
    let paymentController = PaymentAuthorizationController()
    paymentController.present(paymentRequest: request) { [weak self] controller, payment, authCompletion in
      self?.paymentRepository.createStripeToken(payment: payment, completion: { token, error in
        defer { group.leave() }

        guard let token = token, error == nil else {
          return
        }

        fetchedPaymentToken = token
      })
    }
  } else {
    return completion(.init(code: .failureNoPaymentMethod, userActivity: nil))
  }
}
group.wait()

Notes:

Line 1: the fetchedPaymentToken being nil indicates that the user is going to use ApplePay, and therefore this block of code is executed.

Line 7: Because of the issue I'm having with PKPaymentAuthorizationController, this completion handler is never called.