PayPal iOS SDK

The PayPal iOS SDK makes it easy to add PayPal and credit card payments to mobile apps.

Contents

• Use Cases
• Requirements
• Add the SDK to Your Project
• Credentials
• International Support
• Testing
• Documentation
• Usability
• Moving to PayPal iOS SDK 2.0
• Next Steps

Use Cases

The SDK supports two use cases for making payments - Single Payment and Future Payments - and a third use case for obtaining information about the customer - Profile Sharing.

Single Payment

Receive a one-time payment from a customer's PayPal account or payment card (scanned with card.io). This can be either (1) an immediate payment which your servers should subsequently verify, or (2) an authorization for a payment which your servers must subsequently capture, or (3) a payment for an order which your servers must subsequently authorize and capture:

1. Accept a Single Payment and receive back a proof of payment.
2. On your server, Verify the Payment, Capture the Payment, or Process the Order (PayPal Developer site) using PayPal's API.

Future Payments

Your customer logs in to PayPal just one time and consents to future payments:

1. Obtain Customer Consent to receive an authorization code.
2. On your server, use this authorization code to Obtain OAuth2 Tokens.

Later, when that customer initiates a payment:

1. Obtain an Application Correlation ID that you'll pass to your server.
2. On your server, Create a Payment using your OAuth2 tokens, the Application Correlation ID, and PayPal's API.

Profile Sharing

Your customer logs in to PayPal and consents to PayPal sharing information with you:

1. Obtain Customer Consent to receive an authorization code.
2. On your server, use this authorization code to Obtain OAuth2 Tokens.
3. On your server, Retrieve Customer Information using your OAuth2 tokens and PayPal's API.

Requirements

• Xcode 5 and iOS SDK 7
• iOS 6.0+ target deployment
• armv7, armv7s, and arm64 devices, and the simulator (not armv6)
• iPhone and iPad of all sizes and resolutions

Add the SDK to Your Project

1. Clone or download the SDK, which consists of header files, license acknowledgements, release notes, and a static library. It also includes a sample app.
   • As of version 2.4.0, the SDK requires Xcode 6 and iOS 8 SDK. If you are still using Xcode 5, please use version 2.3.2 of this SDK.
2. Add the PayPalMobile directory (containing several .h files and libPayPalMobile.a) to your Xcode project. We recommend checking "Copy items..." and selecting "Create groups...".
3. In your project's Build Settings (in the TARGETS section, not the PROJECTS section):

• add -lc++ -ObjC to Other Linker Flags
• enable Enable Modules (C and Objective-C)
• enable Link Frameworks Automatically

4. In your project's Build Phases, link your project with these libraries. Weak linking for iOS versions back to 6.0 is supported.

• AudioToolbox.framework
• AVFoundation.framework
• CoreLocation.framework
• CoreMedia.framework
• MessageUI.framework
• MobileCoreServices.framework
• SystemConfiguration.framework

5. Add the open source license acknowledgments from acknowledgments.md to your app's acknowledgments.

Credentials

Your mobile integration requires different client_id values for each environment: Live and Test (Sandbox).

Your server integrations for verifying or creating payments will also require the corresponding client_secret for each client_id.

You can obtain these PayPal API credentials by visiting the Applications page on the PayPal Developer site and logging in with your PayPal account.

Sandbox

Once logged in on this Applications page, you will be assigned test credentials, including Client ID, which will let you test your iOS integration against the PayPal Sandbox.

While testing your app, when logging in to PayPal in the SDK's UI you should use a personal Sandbox account email and password. I.e., not your Sandbox business credentials.

You can create both business and personal Sandbox accounts on the Sandbox accounts page.

Live

To obtain your live credentials, you will need to have a business account. If you don't yet have a business account, there is a link at the bottom of that same Applications page that will get you started.

International Support

Localizations

The SDK has built-in translations for many languages and locales. See the header files for a complete list.

Currencies

The SDK supports multiple currencies. See the REST API country and currency documentation for a complete, up-to-date list.

Note that currency support differs for payment card versus PayPal payments. Unless you disable payment card acceptance (via the PayPalConfiguration.acceptCreditCards property), we recommend limiting transactions to currencies supported by both payment types. Currently these are: USD, GBP, CAD, EUR, JPY.

If your app initiates a transaction with a currency that turns out to be unsupported for the user's selected payment type, then the SDK will display an error to the user and write a message to the console log.

Testing

During development and testing, set the environment to Sandbox or NoNetwork/Mock mode, to avoid moving real money around. See the header files for more information.

Documentation

• These docs in the SDK, which include an overview of usage, step-by-step integration instructions, and sample code.
• The sample app included in this SDK.
• Header files are thoroughly documented; refer to them as needed for extra details about any given property or parameter.
• The PayPal Developer Docs, which cover error codes and server-side integration instructions.

Usability

User interface appearance and behavior is set within the library itself. For the sake of usability and user experience consistency, apps should not adjust appearance properties or attempt to modify the SDK's behavior beyond the documented methods in the provided headers.

Specifically, if you are using UIAppearance to modify the appearance of any UI elements in your app, you should reverse those changes prior to presenting our viewcontroller, and set them again after dismissing the viewcontroller.

Moving to PayPal iOS SDK 2.0

Upgrade from 1.x

As a major version change, the API introduced in 2.0 is not backward compatible with 1.x integrations. However, the SDK still supports all previous single payment functionality. Upgrading is straightforward.

• Initialization of the SDK is performed via methods of a new PayPalMobile class.
• Most of the properties of PayPalPaymentViewController have been moved to PayPalConfiguration, and the PayPalPaymentViewController initializer has changed to take such a configuration object.
• The PayPalPaymentDelegate protocol methods have also been altered to include a PayPalPaymentViewController as a parameter.

Older Libraries

PayPal is in the process of replacing the older "Mobile Payments Libraries" (MPL) with the new PayPal Android and iOS SDKs. The new Mobile SDKs are based on the PayPal REST API, while the older MPL uses the Adaptive Payments API.

Until features such as third-party, parallel, and chained payments are available, if needed, you can use MPL:

• MPL on GitHub
• MPL Documentation

Issues related to MPL should be filed in the sdk-packages repo.

Developers with existing Express Checkout integrations or who want additional features may wish to use Mobile Express Checkout in a webview.

Next Steps

Depending on your use case, you can now:

• Accept a single payment
• Obtain user consent to create future payments.
• Obtain user consent to retrieve customer information.