This document provides an integration guide for seamless redirection between merchants and wallets.

The following terms and definitions are used in this document.

Table 1. Terms and definitions

To achieve a seamless redirection between merchants and wallets, merchants need to follow best practices for integration.

Three payment terminals on the merchant side that digital wallets might support are:

• Website
• WAP (Wireless Application Protocol)
• App

The following table shows the payment terminals each digital wallet supports. Payment terminals that are currently not supported yet will be included in the future.

Table 2. Payment terminals supported by each digital wallet

Redirections from merchant to digital wallet side might involve the following terminal types:

• APP to APP: Merchant app to digital wallet app

(Note: If the user did not install the digital wallet app, an H5 page will be used instead.)

• APP to WAP: Merchant app to digital wallet H5 page (WAP)

(Note: When the user did not install the digital wallet app, this case is used.)

• WAP to WAP: Merchant WAP to digital wallet H5 page (WAP)
• WEB to WEB: Merchant website to digital wallet website:

(Note: The digital wallet website might require payment password for payment or provide a QR code for customers to scan and pay.)

Usually, interaction between merchant website and digital wallet website can be processed smoothly. However, interaction between the merchant and digital wallet app or H5 page can sometimes be unsuccessful due to different implementation methods of the merchant and digital wallet terminals. To ensure a smooth redirection process, follow these integration best practices.

Due to various reasons, redirection failure often occurs in the process of evoking the authorization page or redirecting to the merchant side. The following actions need to be taken for the corresponding process:

• Evoke the authorization page: to avoid a failed redirection during this process, it is suggested to use Alipay demo code. For more information, see Demo code for launching a Scheme/H5-Scheme in Apps.
• Redirect to the merchant side: to avoid a failed redirection during this process, it is suggested to provide the URL scheme or allow the H5 page to evoke the app through URL scheme (H5-Scheme). For more information, see Recommended actions for merchant to take.

The following graphic shows an example of the two processes that often fail during a redirection between the merchant app and wallet app:

Figure 1. Redirection between the merchant app and wallet app

In the iOS App

The following code can be used to launch the Scheme/H5-Scheme in an iOS app:

//url is the redirectUrl of merchant from wallet
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 10.0) {
    [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil];
}else{
    [[UIApplication sharedApplication] openURL:url];
}

The following sample shows a payment redirection URL:

https://reddit.app.link/?domain=www.reddit.com&geoip_country=US&user_agent=Mozilla%2F5.0%20(Linux%3B%20Android%208.0.0%3B%20MI%205s%20Plus%20Build%2FOPR1.170623.032%3B%20wv)%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Version%2F4.0%20Chrome%2F71.0.3578.99%20Mobile%20Safari%2F537.36%20MMWEBID%2F3813%20MicroMessenger%2F7.0.5.1421(0x27000540)%20Process%2Ftools%20NetType%2FWIFI%20Language%2Fzh_CN&base_url=%2F&referrer_domain=&referrer_url=&language=&dnt=false&compact_view=true&adblock=false&session_id=P8DTBHyQMksj867rgU&loid=000000000059j450lg&loid_created=1576836949648&reddaid=&utm_term=control_2&utm_medium=mweb&utm_source=xpromo&utm_name=in_feed_refresh&campaign=in_feed_refresh&channel=xpromo&feature=mweb&keyword=control_2&%24og_redirect=https%3A%2F%2Fwww.reddit.com%2F&%24deeplink_path=%2F&%24android_deeplink_path=reddit%2F&mweb_loid=000000000059j450lg&mweb_loid_created=1576836949648&mweb_user_id36=&mweb_user_name=&tags=topbutton_xpromo_listing&utm_content=topbutton_xpromo_listing&nsukey=JDVI%2F0BwufuUTFKh0GcscJ4KqnmdeBzLzfUJMgVfGHPWg0T7ywU0eFpHTN5QkeIrAO2yYgUIw4nDf1E4ctG0CyG3pXgc3BzSNL80%2FsFEkU4ZNIZAzdHjgCcXd6ouC0NGX%2F1U4osY8YSBfDpNhPhyKgZ8hego3Q%2BQ4YW2ERyP7BAjxr%2BG%2F%2FCQU%2FTgh7bnmVohJmG%2Bmrj2n7rApgXhxzbrAg%3D%3D

In the Android App

The following code can be used to launch the Scheme/H5-Scheme in an Android app:

// paymentRedirectUrl is the AppLinks or Scheme of merchant or wallet
// Solution 1:
try {
    Intent intent = Intent.parseUri(paymentRedirectUrl, Intent.URI_INTENT_SCHEME);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
    startActivity(intent);
} catch (Exception e) {
    e.printStackTrace();
}

// Solution 2:
try {
    Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(paymentRedirectUrl));
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
    startActivity(intent);
} catch (Exception e) {
    e.printStackTrace();
}

The merchant needs to provide the URL scheme, an H5 redirection page, or a website redirection URL for different redirections between various terminals. The following table provides details about the recommended actions for merchants to take when processing redirections in different cases.

If you are an acquirer that serves to help merchants integrate with Alipay, you need to ensure:

• The merchant provides the URL scheme.
• The local app can be opened with the address of the scheme protocol in the H5 page.

Table 3. Recommended actions to take for a seamless integration

In sandbox, you can download a test digital wallet to simulate the process of evoking the cashier and redirecting to the merchant side. Test wallets are provided for iOS and Android systems respectively. The download links are as follows:

• Test wallet for the iOS system

Download guide：https://testflight.apple.com/join/JoFxLlfq

• Test wallet for the Android system

Download address: Download

Note: Alipay provides test accounts for merchants to use in the test wallet. The following table shows the details about the provided test accounts:

Table 4. Test accounts