ios - 如何使用 Braintree 实现 Apple Pay？

Question

if(braintree && ![braintree isKindOfClass:[NSNull class]])
{
    self.provider = [braintree paymentProviderWithDelegate:self];
  if ([self.provider canCreatePaymentMethodWithProviderType:BTPaymentProviderTypeApplePay]==0)
  {
     self.provider.paymentSummaryItems = @[[PKPaymentSummaryItem summaryItemWithLabel:@"MakeUp" amount:[NSDecimalNumber decimalNumberWithString:@"1"]]];
  }
  [self.provider createPaymentMethod:BTPaymentProviderTypeApplePay];
  if ([self.provider canCreatePaymentMethodWithProviderType:BTPaymentProviderTypeApplePay]) //False
  {


 }
}

我在这里得到：

canCreatePaymentMethodWithProviderType:BTPaymentProviderTypeApplePay false。

我需要如何以及在哪里展示PKPaymentAuthorizationViewController？