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Documentation Index

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Integrating e-wallet payment functions into native iOS or Android apps allows users to complete payments seamlessly within the app, without being redirected to external browsers.

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Supported Scenarios

In-App payments are suitable for:
  • Native apps with built-in shopping or payment features
  • Invoking wallet payment modules via SDKs (e.g. WeChat, Alipay)
  • Letting users initiate payment inside the app and redirect to a wallet to complete payment

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Common Wallets and Transaction Types

Refer to the following table for pay_type values and related documentation:
Transaction Type (pay_type)WalletDescription
800210WeChatWeChat In-App Payment (via SDK)
801510AlipayHKAlipay Hong Kong In-App Payment (via URL Scheme or SDK)
805810PayMe (HK)PayMe In-App Payment
800710UnionPayUnionPay In-App Payment

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Common Integration Methods

  • SDK Mode: The merchant app uses a third-party SDK to call wallet APIs
  • URL Scheme / Deep Link: Merchant generates a payment link and redirects to the wallet App
  • Redirect Back to App: After payment is completed, the wallet redirects back to the merchant app (requires setting a return URL or deep link binding)

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General API Flow

Most In-App payment types use the POST /trade/v1/payment endpoint to initiate payment requests. The response will include pay_params or a pay_url, which is then passed to the SDK or used to trigger a redirect. Refer to the documentation of each wallet for specific request and response formats.

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Important Notes

  • Each wallet has different requirements — check if App payment permission needs to be pre-approved (e.g. WeChat SDK AppID, Alipay Merchant Setup)
  • Always test redirect and return flow thoroughly to ensure the app receives the payment result properly
  • It’s recommended to use the Transaction Enquiry API to confirm the final payment status, especially if the app is closed before receiving the callback