如何使用Braintree实施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
  {


 }
}

Here i am getting:

canCreatePaymentMethodWithProviderType:BTPaymentProviderTypeApplePay false.

How and where do I need to present PKPaymentAuthorizationViewController ?