curl --include \
     --request POST \
     --header "Content-Type: application/json; charset=utf-8" \
     --header "Authorization: Basic YOUR_REST_API_KEY" \
     --data-binary "{\"app_id\": \"YOUR_APP_ID\",
\"contents\": {\"en\": \"English Message\"},
\"included_segments\": [\"Subscribed Users\"],
\"buttons\": [{\"id\": \"id1\", \"text\": \"button1\", \"icon\": \"ic_menu_share\"}, {\"id\": \"id2\", \"text\": \"button2\", \"icon\": \"ic_menu_send\"}]}" \
     https://onesignal.com/api/v1/notifications

curl --include \
     --request POST \
     --header "Content-Type: application/json; charset=utf-8" \
     --header "Authorization: Basic YOUR_REST_API_KEY" \
     --data-binary "{\"app_id\": \"YOUR_APP_ID\",
\"contents\": {\"en\": \"English Message\"},
\"included_segments\": [\"Subscribed Users\"],
\"web_buttons\": [{\"id\": \"id1\", \"text\": \"button1\", \"icon\": \"ic_menu_share\",\"url\": \"https://yoursite.com\"}, {\"id\": \"id2\", \"text\": \"button2\", \"icon\": \"ic_menu_send\",\"url\": \"https://yoursite.com\"}]}" \
     https://onesignal.com/api/v1/notifications

OneSignal.sendSelfNotification(
  /* Title (defaults if unset) */
  "OneSignal Web Push Notification",
  /* Message (defaults if unset) */
  "Action buttons increase the ways your users can interact with your notification.", 
   /* URL (defaults if unset) */
  'https://example.com/?_osp=do_not_open',
  /* Icon */
  'https://onesignal.com/images/notification_logo.png',
  {
    /* Additional data hash */
    notificationType: 'news-feature'
  }, 
  [{ /* Buttons */
    /* Choose any unique identifier for your button. The ID of the clicked button            is passed to you so you can identify which button is clicked */
    id: 'like-button',
    /* The text the button should display. Supports emojis. */
    text: 'Like',
    /* A valid publicly reachable URL to an icon. Keep this small because it's               downloaded on each notification display. */
    icon: 'http://i.imgur.com/N8SN8ZS.png',
    /* The URL to open when this action button is clicked. See the sections below            for special URLs that prevent opening any window. */
    url: 'https://example.com/?_osp=do_not_open'
  },
  {
    id: 'read-more-button',
    text: 'Read more',
    icon: 'http://i.imgur.com/MIxJp1L.png',
    url: 'https://example.com/?_osp=do_not_open'
  }]
);

class ExampleNotificationOpenedHandler implements OneSignal.NotificationOpenedHandler {
  @Override
  public void notificationOpened(OSNotificationOpenResult result) {
    OSNotificationAction.ActionType actionType = result.action.type;
    JSONObject data = result.notification.payload.additionalData;
    String customKey;

    if (data != null) {
      customKey = data.optString("customkey", null);
      if (customKey != null)
        Log.i("OneSignalExample", "customkey set with value: " + customKey);
    }

    if (actionType == OSNotificationAction.ActionType.ActionTaken)
      Log.i("OneSignalExample", "Button pressed with id: " + result.action.actionID);

    // The following can be used to open an Activity of your choice.
    // Replace - getApplicationContext() - with any Android Context.
    // Intent intent = new Intent(getApplicationContext(), YourActivity.class);
    // intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK);
    // startActivity(intent);

     // Add the following to your AndroidManifest.xml to prevent the launching of your main Activity
     //   if you are calling startActivity above.
     /* 
        <application ...>
          <meta-data android:name="com.onesignal.NotificationOpened.DEFAULT" android:value="DISABLE" />
        </application>
     */
  }
}

let notificationOpenedBlock: OSHandleNotificationActionBlock = { result in
  if let actionID = result?.action.actionID {
    print("actionID =", actionID)
  }
}

^(OSNotificationOpenedResult *result) {
  if (result.action.actionID) {
      NSLog(@"Action ID: ", result.action.actionID)
  }
}

OneSignal.push(["addListenerForNotificationOpened", function(event) {
  console.log("OneSignal notification clicked:", event);
}]);

/* Do NOT call init twice */
OneSignal.push(["init", {
  /* Your other init settings ... */
  notificationClickHandlerMatch: 'origin', /* See API reference: https://documentation.onesignal.com/docs/web-push-sdk#section--notificationopenedcallback- *.
  /* Your other init settings ... */
}]);

OneSignal.push(["addListenerForNotificationOpened", function(event) {
  console.log("OneSignal notification clicked:", event);
  /*
  {
      "id": "96a0dd96-5b63-47e2-9e67-58ca9a315325",
      "heading": "OneSignal Web Push Notification",
      "content": "Action buttons increase the ways your users can interact with your notification.",
      "data": {
          "notificationType": "news-feature"
      },
      "url": "https://example.com",
      "icon": "https://onesignal.com/images/notification_logo.png",
      "buttons": [
          {
              "action": "like-button",
              "title": "Like",
              "icon": "http://i.imgur.com/N8SN8ZS.png",
              "url": "https://example.com"
          },
          {
              "action": "read-more-button",
              "title": "Read more",
              "icon": "http://i.imgur.com/MIxJp1L.png",
              "url": "https://example.com"
          }
      ],
      "action": "like-button"
  }
  */
  
  // We might send a lot of different notifications; the notification we just sent came with additional data that describes the kind of notification that was sent. We sent "notificationType" with our additional data field (notificationType is not built in).
  var isNewsFeatureNotification = event.data && event.data.notificationType === 'news-feature';
  if (isNewsFeatureNotification) {
    // What action button did they click?
    if (event.action === "") {
      // An empty string means the notification body was clicked (no action button was clicked)
      // Keep in mind action buttons are only supported on Chrome 48+ so some users will only be able to click the notification body
    } else if (event.action === 'like-button') {
      // The "Like" action button was clicked
      alert("Glad you liked it! We'll show you similar stories in the future");
    } else if (event.action === 'read-more-button') {
      // The "Read more" action button was clicked
      alert('Showing you the full news article...');
    }
  }
}]);

// Example from Stackoverflow https://stackoverflow.com/questions/41073294/how-to-change-notification-action-text-color-in-android-n/56873390#56873390
Notification notification = new NotificationCompat.Builder(context, channelId)
        ...
        .addAction(new NotificationCompat.Action.Builder(
                            R.drawable.ic_fire,
                            HtmlCompat.fromHtml("<font color=\"" + ContextCompat.getColor(context, R.color.custom_color) + "\">" + context.getString(R.string.fire) + "</font>", HtmlCompat.FROM_HTML_MODE_LEGACY),
                            actionPendingIntent))
                    .build())
        .build();