如何使用Braintree實施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
  {


 }
}

我在這里得到：

canCreatePaymentMethodWithProviderType：BTPaymentProviderTypeApplePay為false。

我需要如何以及在哪里顯示PKPaymentAuthorizationViewController ？