Exploring Apple Pay with Swift

Swift Summit 2015, San Francisco

Transcript

1. EXPLORING PAY WITH SWIFT WENDY LU @WENDYLUWHO
2. AGENDA ▸ When to use Pay ▸ Why use Pay? ▸ Making our first charge
3. WHEN TO USE APPLE PAY
4. “WHEN TRYING TO FIND INNOVATION, LOOK FOR THE INTERSECTION OF THE physical and digital worlds."
5. WHY USE APPLE PAY?
6. Credit Cards ▸ Credit card number: 16 keystrokes ▸ Exp date: 5 keystrokes ▸ CVV: 3 keystrokes ▸ Address: 50+ keystrokes
7. 1 TOUCH
8. MORE SECURE THAN CREDIT CARDS
9. "Apple Pay takes longer than using a credit card if you count the 45 minutes of telling people about it afterwards."
10. MAKING OUR FIRST CHARGE !
12. <PREREQS> Boring Certificate Stuff !
13. Far easier if using a payment network
16. </PREREQS>
17. DEVICE ENABLED PKPaymentAuthorizationViewController.canMakePayments()
18. DEVICE ENABLED PKPaymentAuthorizationViewController. canMakePaymentsUsingNetworks([PKPaymentNetworkVisa, PKPaymentNetworkDiscover])
19. 1) PKPaymentRequest
20. let request = PKPaymentRequest() request.supportedNetworks = [PKPaymentNetworkVisa, PKPaymentNetworkDiscover] request.countryCode = "US" request.currencyCode = "USD" request.merchantIdentifier = "<#Replace me with your Apple Merchant ID#>" request.merchantCapabilities = .Capability3DS
21. let subtotalItem = PKPaymentSummaryItem(label: "Subtotal", amount: NSDecimalNumber(string: "100.00")) let taxItem = PKPaymentSummaryItem(label: "Tax", amount: NSDecimalNumber(string: "8.74")) let totalItem = PKPaymentSummaryItem(label: "Grass-fed Jeans Inc", amount: NSDecimalNumber(string: "108.74")) let summaryItems = [subtotalItem, taxItem, totalItem] request.paymentSummaryItems = summaryItems
22. 2) PKPaymentAuthorizationViewController
23. let viewController = PKPaymentAuthorizationViewController(paymentRequest: request) viewController.delegate = self presentViewController(viewController, animated: true, completion: nil)
25. SHIPPING ADDRESS request.requiredShippingAddressFields = KAddressField.PostalAddress.union(PKAddressField.Phone)
26. SHIPPING ADDRESS - paymentAuthorizationViewController: didSelectShippingContact:completion:
27. PKCONTACT A lot like CNContact
28. Hooray, new Contacts Framework!
29. func paymentAuthorizationViewController(controller: PKPaymentAuthorizationViewController, didSelectShippingContact contact: PKContact, completion: (PKPaymentAuthorizationStatus, [PKShippingMethod], [PKPaymentSummaryItem]) -> Void) { let postalCode = contact.postalAddress?.postalCode if (postalCode != nil) { // Get new tax and shipping methods completion(PKPaymentAuthorizationStatus.Success, shippingMethods, paymentSummaryItems) }
31. 3) PKPaymentToken
32. func paymentAuthorizationViewController(_ controller: PKPaymentAuthorizationViewController, didAuthorizePayment payment: PKPayment, completion completion: (PKPaymentAuthorizationStatus) -> Void)
34. PKPAYMENT - shippingContact: PKContact? - billingContact: PKContact? - shippingMethod: PKShippingMethod? - token: PKPaymentToken
35. Field Notes
37. Privacy: Only get full contact after authorizing payment
38. NSDecimalNumber Float or Double
39. Debugger issues :(
40. PAY
    SWIFT
41. GUARDS AND ERRORS stripeToken : NSString? stripeError : NSError? braintreeToken : NSString? braintreeError : NSError?
42. Obj-C if ([stripeToken length] > 0 && [braintreeToken length] > 0) { if (stripeError == nil) { if (braintreeError == nil) { // Handle payment tokens asynchronously [self createPaymentMethodWithStripeToken:stripeToken braintreeToken:braintreeToken success:sucess failure:failure]; } else { //failure } } else { //failure } } else { //failure }
43. Swift guard stripeToken != nil && stripeToken!.isEmpty == false else { throw PaymentError.EmptyStripeToken } guard stripeError != nil else { throw PaymentError.StripeTokenError } guard braintreeToken != nil && braintreeToken!.isEmpty == false else { throw PaymentError.EmptyBraintreeToken } guard braintreeError != nil else { throw PaymentError.EmptyStripeToken } // Handle payment tokens
44. Currency Formatting
45. Obj-C typedef enum { CurrencyTypeUSDollar = 0, CurrencyTypeCanadianDollar, CurrencyTypeEuro, CurrencyTypePound, } CurrencyType; NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init]; formatter.numberStyle = NSNumberFormatterCurrencyStyle; switch (currency) { case CurrencyTypeUSDollar: formatter.locale = [NSLocale localeWithLocaleIdentifier:@"en_US"]; break; case CurrencyTypeCanadianDollar: formatter.locale = [NSLocale localeWithLocaleIdentifier:@"en_CA"]; break; case CurrencyTypeEuro: formatter.locale = [NSLocale localeWithLocaleIdentifier:@"fr_FR"]; break; case CurrencyTypePound: formatter.locale = [NSLocale localeWithLocaleIdentifier:@"en_GB"]; break; } NSString *formattedPrice = [formatter stringFromNumber:number];
46. Swift enum CurrencyType : String { case USDollar = "en_US", CanadianDollar = "en_CA", Euro = "fr_FR", Pound = "en_GB" } let formatter = NSNumberFormatter() formatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle formatter.locale = NSLocale(localeIdentifier: currencyType.rawValue) let formattedPrice = formatter.stringFromNumber(number)
48. Thanks! @wendyluwho