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Merge pull request #1499 from stripe/yuki/auto-apple-pay
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STPApplePayContext
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@yuki-stripe
yuki-stripe authored Apr 2, 2020
2 parents c81697a + e8225cc commit 48190cd
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200 changes: 66 additions & 134 deletions Example/Non-Card Payment Examples/ApplePayExampleViewController.m
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Original file line number Diff line number Diff line change
Expand Up @@ -18,184 +18,116 @@
This example demonstrates creating a payment using Apple Pay. First, we configure a PKPaymentRequest
with our payment information and use it to present the Apple Pay UI. When the user updates their
shipping address, we use the example ShippingManager class to fetch the appropriate shipping methods for
that address. After the user submits their information, we create a token using the authorized PKPayment,
and then send it to our backend to create the charge request.
that address. After the user submits their information, the Stripe SDK completes the payment.
*/
@interface ApplePayExampleViewController () <PKPaymentAuthorizationViewControllerDelegate, STPAuthenticationContext>
@interface ApplePayExampleViewController () <STPApplePayContextDelegate>
@property (nonatomic) ShippingManager *shippingManager;
@property (nonatomic, weak) UIButton *payButton;
@property (nonatomic) BOOL applePaySucceeded;
@property (nonatomic) NSError *applePayError;
@property (nonatomic) PKPaymentAuthorizationViewController *applePayVC;
@property (nonatomic, weak) PKPaymentButton *payButton;
@property (nonatomic, weak) UIActivityIndicatorView *activityIndicator;
@end

@implementation ApplePayExampleViewController

- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
#ifdef __IPHONE_13_0
#ifdef __IPHONE_13_0
if (@available(iOS 13.0, *)) {
self.view.backgroundColor = [UIColor systemBackgroundColor];
}
#endif
#endif
self.title = @"Apple Pay";
self.edgesForExtendedLayout = UIRectEdgeNone;

self.shippingManager = [[ShippingManager alloc] init];

UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
[button setTitle:@"Pay with Apple Pay" forState:UIControlStateNormal];
[button sizeToFit];
PKPaymentButton *button = [PKPaymentButton buttonWithType:PKPaymentButtonTypeBuy style:PKPaymentButtonStyleBlack];
[button addTarget:self action:@selector(pay) forControlEvents:UIControlEventTouchUpInside];
button.enabled = [self applePayEnabled];
self.payButton = button;
[self.view addSubview:button];

UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
activityIndicator.hidesWhenStopped = YES;
self.activityIndicator = activityIndicator;
[self.view addSubview:activityIndicator];
}

- (void)viewDidLayoutSubviews {
[super viewDidLayoutSubviews];
CGRect bounds = self.view.bounds;
self.payButton.center = CGPointMake(CGRectGetMidX(bounds), 100);
self.activityIndicator.center = CGPointMake(CGRectGetMidX(bounds),
CGRectGetMaxY(self.payButton.frame) + 15*2);
}

- (BOOL)applePayEnabled {
PKPaymentRequest *paymentRequest = [self buildPaymentRequest];
if (paymentRequest) {
return [Stripe canSubmitPaymentRequest:paymentRequest];
}
return NO;
}

- (PKPaymentRequest *)buildPaymentRequest {
if ([PKPaymentRequest class]) {
PKPaymentRequest *paymentRequest = [Stripe paymentRequestWithMerchantIdentifier:AppleMerchantId
country:@"US"
currency:@"USD"];
[paymentRequest setRequiredShippingContactFields:[NSSet setWithObject:PKContactFieldPostalAddress]];
[paymentRequest setRequiredBillingContactFields:[NSSet setWithObject:PKContactFieldPostalAddress]];
paymentRequest.shippingMethods = [self.shippingManager defaultShippingMethods];
paymentRequest.paymentSummaryItems = [self summaryItemsForShippingMethod:paymentRequest.shippingMethods.firstObject];
return paymentRequest;
}
return nil;
}

- (void)pay {
self.applePaySucceeded = NO;
self.applePayError = nil;

PKPaymentRequest *paymentRequest = [self buildPaymentRequest];
if ([Stripe canSubmitPaymentRequest:paymentRequest]) {
self.applePayVC = [[PKPaymentAuthorizationViewController alloc] initWithPaymentRequest:paymentRequest];
self.applePayVC.delegate = self;

if (self.applePayVC) {
[self presentViewController:self.applePayVC animated:YES completion:nil];
} else {
NSLog(@"Apple Pay returned a nil PKPaymentAuthorizationViewController - make sure you've configured Apple Pay correctly, as outlined at https://stripe.com/docs/mobile/apple-pay");
}
}
}

- (NSArray *)summaryItemsForShippingMethod:(PKShippingMethod *)shippingMethod {
- (NSArray *)_summaryItemsForShippingMethod:(PKShippingMethod *)shippingMethod {
PKPaymentSummaryItem *shirtItem = [PKPaymentSummaryItem summaryItemWithLabel:@"Cool Shirt" amount:[NSDecimalNumber decimalNumberWithString:@"10.00"]];
NSDecimalNumber *total = [shirtItem.amount decimalNumberByAdding:shippingMethod.amount];
PKPaymentSummaryItem *totalItem = [PKPaymentSummaryItem summaryItemWithLabel:@"Stripe Shirt Shop" amount:total];
return @[shirtItem, shippingMethod, totalItem];
}

#pragma mark - PKPaymentAuthorizationViewControllerDelegate

- (void)paymentAuthorizationViewController:(PKPaymentAuthorizationViewController *)controller didSelectShippingContact:(PKContact *)contact handler:(void (^)(PKPaymentRequestShippingContactUpdate * _Nonnull))completion {
[self.shippingManager fetchShippingCostsForAddress:contact.postalAddress
completion:^(NSArray *shippingMethods, NSError *error) {
completion([[PKPaymentRequestShippingContactUpdate alloc] initWithErrors:error ? @[error] : nil
paymentSummaryItems:[self summaryItemsForShippingMethod:shippingMethods.firstObject]
shippingMethods:shippingMethods]);
}];
}

- (void)paymentAuthorizationViewController:(PKPaymentAuthorizationViewController *)controller didSelectShippingMethod:(PKShippingMethod *)shippingMethod handler:(void (^)(PKPaymentRequestShippingMethodUpdate * _Nonnull))completion {
completion([[PKPaymentRequestShippingMethodUpdate alloc] initWithPaymentSummaryItems:[self summaryItemsForShippingMethod:shippingMethod]]);
- (void)pay {
// Build the payment request
PKPaymentRequest *paymentRequest = [Stripe paymentRequestWithMerchantIdentifier:AppleMerchantId country:@"US" currency:@"USD"];
[paymentRequest setRequiredShippingContactFields:[NSSet setWithObject:PKContactFieldPostalAddress]];
[paymentRequest setRequiredBillingContactFields:[NSSet setWithObject:PKContactFieldPostalAddress]];
paymentRequest.shippingMethods = [self.shippingManager defaultShippingMethods];
paymentRequest.paymentSummaryItems = [self _summaryItemsForShippingMethod:paymentRequest.shippingMethods.firstObject];

// Initialize STPApplePayContext
STPApplePayContext *applePayContext = [[STPApplePayContext alloc] initWithPaymentRequest:paymentRequest delegate:self];

// Present Apple Pay
if (applePayContext) {
[self.activityIndicator startAnimating];
self.payButton.enabled = NO;
[applePayContext presentApplePayOnViewController:self completion:nil];
} else {
NSLog(@"Make sure you've configured Apple Pay correctly, as outlined at https://stripe.com/docs/apple-pay#native");
}
}

- (void)paymentAuthorizationViewController:(PKPaymentAuthorizationViewController *)controller didAuthorizePayment:(PKPayment *)payment handler:(void (^)(PKPaymentAuthorizationResult * _Nonnull))completion API_AVAILABLE(ios(11.0)) {
[[STPAPIClient sharedClient] createPaymentMethodWithPayment:payment completion:^(STPPaymentMethod *paymentMethod, NSError *error) {
if (error) {
NSError *pkError = [STPAPIClient pkPaymentErrorForStripeError:error];
PKPaymentAuthorizationResult *result = [[PKPaymentAuthorizationResult alloc] initWithStatus:PKPaymentAuthorizationStatusFailure errors:@[pkError]];
completion(result);
} else {
// We could also send the token.stripeID to our backend to create
// a payment method and subsequent payment intent
[self _createAndConfirmPaymentIntentWithPaymentMethod:paymentMethod
completion:completion];
}
}];
}
#pragma mark - STPApplePayContextDelegate

- (void)_createAndConfirmPaymentIntentWithPaymentMethod:(STPPaymentMethod *)paymentMethod completion:(void (^)(PKPaymentAuthorizationResult * _Nonnull))completion {
// Some observations on iOS 12 simulator:
// - If you call the completion block w/ a status of .failure and an error, the user is prompted to try again. Otherwise, the sheet is dismissed.
// - The docs say localizedDescription can be shown in the Apple Pay sheet, but I haven't observed this.

// 3. Check the status
STPPaymentHandlerActionPaymentIntentCompletionBlock paymentHandlerCompletion = ^(STPPaymentHandlerActionStatus handlerStatus, STPPaymentIntent * _Nullable paymentIntent, NSError * _Nullable handlerError) {
switch (handlerStatus) {
case STPPaymentHandlerActionStatusFailed:
self.applePayError = handlerError;
completion([[PKPaymentAuthorizationResult alloc] initWithStatus:PKPaymentAuthorizationStatusFailure
errors:@[[STPAPIClient pkPaymentErrorForStripeError:self.applePayError]]]);
break;
case STPPaymentHandlerActionStatusCanceled:
completion([[PKPaymentAuthorizationResult alloc] initWithStatus:PKPaymentAuthorizationStatusFailure errors:nil]);
break;
case STPPaymentHandlerActionStatusSucceeded:
completion([[PKPaymentAuthorizationResult alloc] initWithStatus:PKPaymentAuthorizationStatusSuccess errors:nil]);
break;
}
};

// 1. Create a PaymentIntent on the backend. This is typically done at the beginning of the checkout flow.
- (void)applePayContext:(STPApplePayContext *)context didCreatePaymentMethod:(__unused STPPaymentMethod *)paymentMethod completion:(STPIntentClientSecretCompletionBlock)completion {
// Create the Stripe PaymentIntent representing the payment on our backend
[[MyAPIClient sharedClient] createPaymentIntentWithCompletion:^(MyAPIClientResult status, NSString *clientSecret, NSError *error) {
if (status == MyAPIClientResultFailure || error) {
self.applePayError = error;
completion([[PKPaymentAuthorizationResult alloc] initWithStatus:PKPaymentAuthorizationStatusFailure
errors:@[[STPAPIClient pkPaymentErrorForStripeError:self.applePayError]]]);
return;
}

STPPaymentIntentParams *paymentIntentParams = [[STPPaymentIntentParams alloc] initWithClientSecret:clientSecret];
paymentIntentParams.paymentMethodId = paymentMethod.stripeId;

// 2. Confirm the PaymentIntent with the Apple Pay PaymentMethod
[[STPPaymentHandler sharedHandler] confirmPayment:paymentIntentParams
withAuthenticationContext:self
completion:paymentHandlerCompletion];
// Call the completion block with the PaymentIntent's client secret
completion(clientSecret, error);
} additionalParameters:nil];
}

- (void)paymentAuthorizationViewControllerDidFinish:(PKPaymentAuthorizationViewController *)controller {
dispatch_async(dispatch_get_main_queue(), ^{
// This only gets called if you call the PKPaymentAuthorizationStatus completion block before dismissing PKPaymentAuthorizationViewController
[self dismissViewControllerAnimated:YES completion:^{
if (self.applePaySucceeded) {
[self.delegate exampleViewController:self didFinishWithMessage:@"Payment successfully created"];
} else if (self.applePayError) {
[self.delegate exampleViewController:self didFinishWithError:self.applePayError];
}
self.applePaySucceeded = NO;
self.applePayError = nil;
self.applePayVC = nil;
}];
});
- (void)applePayContext:(STPApplePayContext *)context didCompleteWithStatus:(STPPaymentStatus)status error:(NSError *)error {
[self.activityIndicator stopAnimating];
self.payButton.enabled = YES;

switch (status) {
case STPPaymentStatusSuccess:
[self.delegate exampleViewController:self didFinishWithMessage:@"Payment successfully created"];
break;

case STPPaymentStatusError:
[self.delegate exampleViewController:self didFinishWithError:error];
break;

case STPPaymentStatusUserCancellation:
break;
}
}

#pragma mark - STPAuthenticationContext
- (void)applePayContext:(STPApplePayContext *)context didSelectShippingContact:(PKContact *)contact handler:(void (^)(PKPaymentRequestShippingContactUpdate * _Nonnull))completion {
[self.shippingManager fetchShippingCostsForAddress:contact.postalAddress
completion:^(NSArray *shippingMethods, NSError *error) {
completion([[PKPaymentRequestShippingContactUpdate alloc] initWithErrors:error ? @[error] : nil
paymentSummaryItems:[self _summaryItemsForShippingMethod:shippingMethods.firstObject]
shippingMethods:shippingMethods]);
}];
}

- (UIViewController *)authenticationPresentingViewController {
return self;
- (void)applePayContext:(STPApplePayContext *)context didSelectShippingMethod:(PKShippingMethod *)shippingMethod handler:(void (^)(PKPaymentRequestShippingMethodUpdate * _Nonnull))completion {
NSArray *updatedSummaryItems = [self _summaryItemsForShippingMethod:shippingMethod];
completion([[PKPaymentRequestShippingMethodUpdate alloc] initWithPaymentSummaryItems:updatedSummaryItems]);
}

@end
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