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Setup

Please follow the common Adyen instructions to get set up with Alipay. Next, make sure to enable Alipay as a payment method on your configured account.

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Testing

Adyen has instructions on how to test Alipay.

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Integration

For the alternative payment methods the default integration for Adyen is through a redirect to a hosted payments page.

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Redirect integration

Start by creating a new transaction with the following required fields.
POST /transactions
{
  "amount": 100,
  "currency": "EUR",
  "country": "NL",
  "intent": "capture",
  "payment_method": {
    "method": "<method>",
    "redirect_url": "https://example.com/callback",
    "country": "NL",
    "currency": "EUR"
  }
}
Please use "" for the value of the <method>.
After the transaction is created, the API response includes payment_method.approval_url and the transaction will be in the buyer_approval_pending state. 
{
  "type": "transaction",
  "id": "ea1efdd0-20f9-44d9-9b0b-0a3d71e9b625",
  "payment_method": {
    "type": "payment-method",
    "approval_url": "https://cdn.sandbox.spider.gr4vy.app/connectors/adyen/apm.html?token=..."
  },
  "method": "<method>"
}
Redirect the buyer to the approval_url (open in a browser or Webview) so they can complete authentication and approve the payment. After approval the buyer is redirected to the redirect_url you provided when creating the transaction. Do not rely solely on the redirect — either poll the transaction or (recommended) rely on webhooks to detect the final status (for example capture_succeeded or failure states).

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Direct integration

Adyen provides web, Android and iOS for a direct integration. For these flows you should indicate the platform by setting an appropriate integration_client when creating the transaction, and then build a client-side integration that uses the POST /transactions/:transaction_id/session API to initialize the Adyen SDK. To start, create a new transaction with the appropriate integration_client. 
POST /transactions

{
  "amount": 100,
  "currency": "EUR",
  "country": "NL",
  "intent": "capture",
  "integration_client": "web",
  "payment_method": {
    "method": "<method>",
    "redirect_url": "https://example.com/callback",
    "country": "NL",
    "currency": "EUR"
  }
}
Please use "" for the value of the <method>.
After the transaction is created, the API response includes a session_token which can be used to get the session data for that transaction. 
POST /transactions/:transaction_id/session?token=:session_token

{
  "session_data": {
    "sessionId": "CS04C0B8AC9849A7D8E25B20D",
    "sessionData": "Ab02b4c0!BQABAgBLgbLpvkt1r3",
    "environment": "live",
    "clientKey": "client-key",
    "returnUrl": "https://example.com/callback",
    "paymentMethod": "<method>",
    "storePaymentMethod": true // this is an optional key
  },
  "default_completion_url": "https://api.sandbox.spider.gr4vy.app/transactions/approve/some-token",
  "integration_client": "web"
}
This session data provides the sessionId and sessionData required to load the Adyen SDK. 
// Determine the URL of the script, and the method to invoke on the Adyen SDK
const adyenEnvironment = sessionData.environment;
const clientKey = sessionData.clientKey;
const sessionId = sessionData.sessionId;
const adyenSessionData = sessionData.sessionData;
const returnUrl = sessionData.returnUrl;
const paymentMethod = sessionData.paymentMethod;
const storePaymentMethod = sessionData.storePaymentMethod;
const configuration = {
    environment: adyenEnvironment,
    clientKey,
    analytics: {
      enabled: false,
    },
    session: {
      id: sessionId,
      sessionData: adyenSessionData,
    },
    paymentMethodsConfiguration: {
      cashapp: { // only cashapp requires this configuration
        storePaymentMethod: storePaymentMethod,
      },
    },
}
AdyenCheckout(configuration).then(function (checkout) {
  let component = checkout
    .create(paymentMethod)
    .mount('#component');
  });

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Mobile redirect integration completion

On Mobile integrations, after the buyer completes the payment flow, send a GET request to the default_completion_url provided in the session response with the sessionId and the redirectResult as query parameters to finalize the transaction. Related docs The call return a 204 No Content response. After receiving the 204 response, you can poll the transaction or rely on webhooks to detect the final status. 
// When you are handling the redirect
func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey: Any] = [:]) -> Bool {
    if url.absoluteString.starts(with: RedirectComponent.redirectResultScheme) {
        let components = URLComponents(url: url, resolvingAgainstBaseURL: false)
        let queryItems = components?.queryItems
        let redirectResult = queryItems?.first(where: { $0.name == "redirectResult" })?.value
        
        var urlComponents = URLComponents(string: defaultCompletionUrl)!
        urlComponents.queryItems = [
            URLQueryItem(name: "sessionId", value: /* your session id */),
            URLQueryItem(name: "redirectResult", value: redirectResult)
        ]
        
        var request = URLRequest(url: urlComponents.url!)
        request.httpMethod = "GET"
        let task = URLSession.shared.dataTask(with: request) { data, response, error in
            // Handle 204 response, you can now poll the transaction
        }
        task.resume()
        return true
    }
    return false
}
Please refer to the Adyen documentation for the web, Android and iOS for further guidance