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1.  Overview

2.  Requirements

   1. Preparation
   2. Development
   3. Apple Pay

3.  Installation

4.  How to implement

   1. Configuration
   2. Authentication
   3. Making a payment
      1. Retrieve payment methods
      2. Configure payment data
      3. Show payment methods to the user
      4. Checkout
   4. Apple Pay
      1. Configuration
         1. Apple Pay developer page
         2. XCode Project
         3. Testing Apple Pay transactions
      2. Usage
         1. Payment data
         2. Present PKPaymentAuthorizationViewController
      3. iOS Human Interface Guidelines
   5. WeChat Pay
   6. PayPal SDK