How to open payment UI in mobile application

Note
To quickly integrate Xsolla services, you can use ready-made SDKs:
  • Xsolla Mobile SDK — the recommended option to expand payment options and stay compliant with platform requirements.
  • SDKs for Android — a solution for quick implementation of payment acceptance using all methods offered by Xsolla: bank and credit cards, e-wallets, QR codes, and native methods, e.g., Google Pay.
To receive payments in a mobile application, you can use the following options for opening the payment UI:
  • In a browser — in this case, a user is redirected to an external browser from the game to make a payment. The payment UI will look like this:
  • In Android WebView — in this case, the payment UI opens seamlessly within the game application, like this:
  • In Custom Tabs — in this case, the payment UI opens inside the game application, but a user sees a browser’s bar. The payment UI will look like this:

In browser

To open the payment UI in a browser and receive payments via any methods offered by Xsolla, follow the instruction for opening the payment UI.

In Android WebView

Android WebView is a pre-installed system component from Google that allows Android applications to display web content. For the payment UI to work correctly in Android WebView, you need to configure WebView and set up the setWebViewClient and setWebChromeClient methods.

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mWebView.setWebViewClient(new XsollaWebViewClient(this));
mWebView.setWebChromeClient(new XsollaWebChromeClient(this));

To configure opening the payment UI in Android WebView:

  1. Configure WebView according to this example:

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WebSettings webSettings = mWebView.getSettings();
webSettings.setBuiltInZoomControls(false);
webSettings.setUseWideViewPort(true);
webSettings.setDomStorageEnabled(true);
webSettings.setLoadWithOverviewMode(true);
webSettings.setJavaScriptEnabled(true);
webSettings.setSupportMultipleWindows(true);
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
  1. Implement the XsollaWebViewClient class, that is inherited from the WebViewClient class, and overrides the shouldOverrideUrlLoading and onPageFinished methods according to this example:
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class XsollaWebViewClient extends WebViewClient {
    private final Context context;


    public XsollaWebViewClient(Context context) {
        this.context = context;
    }


    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        if(url.matches(".+://.*")) {
            try {
                Intent intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME);
                intent.addCategory("android.intent.category.BROWSABLE");
                intent.setComponent(null);
                context.startActivity(intent);
            } catch(URISyntaxException e) {
                Log.e("WebView", "Invalid URL format" + url, e);
            } catch (ActivityNotFoundException e) {
                Log.e("WebView", "No activity found to handle URL: " + url, e);
            }
            return true;
        }


        return false;
    }


    @Override
    public void onPageFinished(WebView view, String url) {
        super.onPageFinished(view, url);
    }
}
  1. Implement the XsollaWebChromeClient class, that is inherited from the WebChromeClient class, and overrides the onCreateWindow and onCloseWindow methods within it.
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public class XsollaWebChromeClient extends WebChromeClient {
    private final Context mContext;

    public XsollaWebChromeClient(Context context) {
        mContext = context;
    }

    @Override
    public boolean onCreateWindow(WebView view, boolean isDialog, boolean isUserGesture, android.os.Message resultMsg) {
        MainActivity mainActivity = (MainActivity) mContext;

        WebView.WebViewTransport transport = (WebView.WebViewTransport) resultMsg.obj;
        transport.setWebView(mainActivity.mChildWebView);
        resultMsg.sendToTarget();
        return true;
    }
}
  1. Implement the XsollaChildWebView class inherited from the WebView class.
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public class XsollaChildWebView extends WebView {


    @SuppressLint("SetJavaScriptEnabled")
    public XsollaChildWebView(Context context, AttributeSet attrs) {
        super(context, attrs);


        WebSettings webSettings = getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setDomStorageEnabled(true);


        setWebViewClient(new XsollaWebViewClient(context));
        setWebChromeClient(new XsollaWebChromeClient(context));
    }
}
  1. Declare the mChildWebView variable as a field in the MainActivity class:
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mChildWebView = findViewById(R.id.childWebView);

The second WebView (childWebView) is used for opening new windows in the payment UI:

Example of implementing the activity:

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <WebView
        android:id="@+id/mainWebView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <com.example.app.XsollaChildWebView
        android:id="@+id/childWebView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>
Note
Refer to the GitHub repository for detailed code samples.

In Custom Tabs

Custom Tabs is a feature in Android browsers that allow developers to add a customized browser experience directly within the application. The difference between WebView and Custom Tabs is that user actions in WebView are isolated from their other Internet actions, whereas using Custom Tabs allows synchronization of user actions with their other activity in Chrome on their Android device.

Code sample for opening the payment UI in Custom Tabs:

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String url = "https://secure.xsolla.com/paystation4?token=${token}";
CustomTabsIntent.Builder builder = new CustomTabsIntent.Builder();
CustomTabsIntent customTabsIntent = builder.build();
customTabsIntent.launchUrl(this, Uri.parse(url));
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Last updated: July 26, 2024

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