PKPaymentAuthorizationViewController present as nil view controller - ios8

Question

I am trying to integrate Apple Pay in my demo app following this link & I am facing this issue issue. I have updated my iphone 6+ os to 8.1.1 version but still not able to present PKPaymentAuthorizationViewController properly & I am getting this error "Application tried to present a nil modal view controller on target".Please suggest something since I am stuck on this.Here is the code which I have written :-
PKPaymentRequest *request = [[PKPaymentRequest alloc] init];
request.currencyCode = #"USD";
request.countryCode = #"US";
// This is a test merchant id to demo the capability, this would work with Visa cards only.
request.merchantIdentifier = #"merchant.com.procharge"; // replace with YOUR_APPLE_MERCHANT_ID
request.applicationData = [#"" dataUsingEncoding:NSUTF8StringEncoding];
request.merchantCapabilities = PKMerchantCapability3DS;
request.supportedNetworks = #[PKPaymentNetworkMasterCard, PKPaymentNetworkVisa, PKPaymentNetworkAmex];
request.requiredBillingAddressFields = PKAddressFieldPostalAddress|PKAddressFieldPhone|PKAddressFieldEmail;
request.requiredShippingAddressFields = PKAddressFieldPostalAddress|PKAddressFieldPhone|PKAddressFieldEmail;
///Set amount here
NSString *amountText = #"0.01"; // Get the payment amount
NSDecimalNumber *amountValue = [NSDecimalNumber decimalNumberWithString:amountText];
PKPaymentSummaryItem *item = [[PKPaymentSummaryItem alloc] init];
item.amount = amountValue;
//item.amount = [[NSDecimalNumber alloc] initWithInt:20];
item.label = #"Test Payment Total";
request.paymentSummaryItems = #[item];
PKPaymentAuthorizationViewController *vc = nil;
// need to setup correct entitlement to make the view to show
#try
{
vc = [[PKPaymentAuthorizationViewController alloc] initWithPaymentRequest:request];
}
#catch (NSException *e)
{
NSLog(#"Exception %#", e);
}
if (vc != nil)
{
vc.delegate = self;
[self presentViewController:vc animated:YES completion:CompletionBlock];
}
else
{
//The device cannot make payments. Please make sure Passbook has valid Credit Card added.
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"PassKit Payment Error"
message:NSLocalizedString(#"The device cannot make payment at this time. Please check Passbook has Valid Credit Card and Payment Request has Valid Currency & Apple MerchantID.", #"")
delegate:nil
cancelButtonTitle:NSLocalizedString(#"OK", #"")
otherButtonTitles:nil];
[alert show];
}
Thanks & Regards

Answer 1

Did you implement these methods to check before trying to present the viewcontroller?
// Determine whether this device can process payment requests.
// YES if the device is generally capable of making in-app payments.
// NO if the device cannot make in-app payments or if the user is restricted from authorizing payments.
+ (BOOL)canMakePayments;
// Determine whether this device can process payment requests using specific payment network brands.
// Your application should confirm that the user can make payments before attempting to authorize a payment.
// Your application may also want to alter its appearance or behavior when the user is not allowed
// to make payments.
// YES if the user can authorize payments on this device using one of the payment networks supported
// by the merchant.
// NO if the user cannot authorize payments on these networks or if the user is restricted from
// authorizing payments.
+ (BOOL)canMakePaymentsUsingNetworks:(NSArray *)supportedNetworks;