WebView Integration

Reference to integrate the Widget as a WebView on your mobile application


To integrate the Widget using a WebView on iOS and Android, you must use the following HTML:


The widget configuration needs to be passed through a querystring instead of using client side JavaScript.


Using React Native?

Check our @fintoc/fintoc-react-native npm library to integrate the WebView to your application quickly!

How it works

When including the Fintoc WebView in your mobile application, you need to pass the following query params to configure it, depending on the product that you want to use:

public_keystringThe public_key is used to identify your web application or web page within Fintoc. Links created with a public_key will get assigned to the organization or user that owns said public_key.
This token will determine whether you're using the sandbox or the production environment. Remember that the public_key of the sandbox starts with pk_test_, while the production one starts with pk_live_.
holder_typestringThe holder_type parameter can be business or individual, and determines the type of account that will be connected to Fintoc.
productstringThe product parameter can be movements, subscriptions, invoices, tax_returns, tax_statements or payments, and determines the product and type of Link that will be created.
countrystringThe country parameter must be the ISO 3166-1 alfa-2 code of the country to which you're trying to connect. It can be cl or mx. Defaults to cl.
institution_idstringOptional. The institution_id parameter corresponds to the id of a financial institution. If included, said institution will be pre-selected. For example, the value mx_banco_banamex would command the widget to open with Banamex by default.
usernamestringOptional. The username parameter corresponds to the username of a financial institution. If included it will fill the username field of the financial institution login form and prevent the user from editing it.
webhook_urlstringThe webhook_url parameter corresponds to the URL that will get a request with the new Link after its successful creation, including its link_token.
widget_tokenstringThe widget_token parameter corresponds to the token created by the backend that initializes and configures the widget.

Right now, only the payments and subscriptions products uses a widget_token parameter.

Usage Example

Here are some snippets to get you started as quickly as humanly possible:

override fun onCreate(savedInstanceState: Bundle?) {
  val widgetInitizalizationUrl = generateWidgetInitializationUrl()
  // Modify Webview settings - all of these settings may not be applicable
  // or necessary for your integration.
  val fintocWebview = findViewById<WebView>(R.id.webview)
  val webSettings = fintocWebview.settings
  webSettings.javaScriptEnabled = true
  webSettings.domStorageEnabled = true
  webSettings.cacheMode = WebSettings.LOAD_NO_CACHE
  webSettings.useWideViewPort = true


private fun generateWidgetInitializationUrl() : Uri {
  val builder = Uri.parse("https://webview.fintoc.com/widget.html")
    .appendQueryParameter("holder_type", "individual")
    .appendQueryParameter("product", "payments")
    .appendQueryParameter("public_key", "pk_live_INSERT_YOUR_API_KEY")
    .appendQueryParameter("widget_token", "pi_INSERT_YOUR_sec_WIDGET_TOKEN")
    return builder.build()
import UIKit
import WebKit

class ViewController: UIViewController, WKNavigationDelegate, UIScrollViewDelegate, WKUIDelegate {

    private var webView: WKWebView!

    override func loadView() {
        let webConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        webView.uiDelegate = self
        view = webView

    override func viewDidLoad() {
        webView.navigationDelegate = self
        webView.allowsBackForwardNavigationGestures = false
        webView.scrollView.bounces = false
        webView.isMultipleTouchEnabled = false

        // zoom
        webView.scrollView.delegate = self
        webView.scrollView.minimumZoomScale = 1.0
        webView.scrollView.maximumZoomScale = 1.0

        let url = generateInitializationURL()
        webView.load(URLRequest(url: url))

    override var prefersStatusBarHidden : Bool {
        return true

    @objc(scrollViewWillBeginZooming:withView:) func scrollViewWillBeginZooming(_ scrollView: UIScrollView, with view: UIView?) {
        scrollView.pinchGestureRecognizer?.isEnabled = false

    func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
        if let url = navigationAction.request.url {
        return nil

    func generateInitializationURL() -> URL {
        let params = [
            "holder_type": "individual",
            "product": "payments",
            "public_key": "pk_live_INSERT_YOUR_API_KEY",
            "widget_token": "pi_INSERT_YOUR_sec_WIDGET_TOKEN",
        var components = URLComponents()
        components.scheme = "https"
        components.host = "webview.fintoc.com"
        components.path = "/widget.html"
        let queryItems = params.map { URLQueryItem(name: $0, value: $1) }
        components.queryItems = queryItems
        return components.url!

Notice that the Swift example has a webView method. This method defines what happens when a user clicks on a link inside the WebView. On the example, the link gets opened in Safari, but you can customize this behaviour at will (links could be opened inside the same application, for example). This is important because, when using the Payment Initiation product, after finishing the payment flow the user can click a link to download the transaction voucher. You should allow links to be opened.

WebView Redirections

Once the WebView is integrated, you can interact with its events using redirections.

MethodRedirect URLDescription
onSuccessfintocwidget://succeededThis event will be occur after a Link gets created successfully.
onExitfintocwidget://exitThis event will occur after a user closes the Widget prematurely.

To use these methods on Android and iOS, you can use the following snippets:

webview.webViewClient = object : WebViewClient() {
  override fun shouldOverrideUrlLoading(view: WebView?, url: String?): Boolean {
    val parsedUri = Uri.parse(url)
    if (parsedUri.scheme.equals("fintocwidget")) {
      val action: String? = parsedUri.host
      val linkData: HashMap<String, String?>? = parseLinkUriData(parsedUri)
      if (action.equals("succeeded")) {
        // onSuccess
      if (action.equals("exit")) {
        // onExit
    return true
webview.setWebViewClient(new WebViewClient() {
  public boolean shouldOverrideUrlLoading(WebView view, String url) {
    Uri parsedUri = Uri.parse(url);
    if (parsedUri.getScheme().equals("fintocwidget")) {
      String action = parsedUri.getHost();
      HashMap<String, String> linkData = parseLinkUriData(parsedUri);
      if (action.equals("succeeded")) {
        // onSuccess
      if (action.equals("exit")) {
        // onExit
func webView(
      _ webView: WKWebView,
      decidePolicyFor navigationAction: WKNavigationAction,
      decisionHandler: @escaping ((WKNavigationActionPolicy) -> Void)
    ) {
      guard let url = navigationAction.request.url else {
      let linkScheme = "fintocwidget";
      let actionScheme = url.scheme;
      let actionType = url.host ?? "";
      if actionScheme == linkScheme {
        switch actionType {
        case "succeeded":
          // onSuccess
        case "exit":
          // onExit
          print("Widget action detected: \(actionType)")