In the next step, you will be asked to enter your WordPress site URL, Google Server API key, and URL for your default notification icon image.

If your website does not support SSL/HTTPS, then you need to check the box next to ‘My site is not fully HTTPS’ option.

Google Chrome does not support web push notifications for non-ssl or http websites. OneSignal solves this problem by subscribing users to a sub-domain on their own https domain.

Checking ‘My site is not fully HTTPS’ option will display HTTP fallback options. You will need to choose a sub-domain for your app and enter Google Project Number or Sender ID you generated in the first step.

Click on the Save button to continue. Now you can exit this dialog box. You will be prompted with a notice that your setup isn’t complete yet and can be resumed later. Click Yes to close the dialog box.

Step 3: Getting OneSignal Keys

You need to get OneSignal Keys for your website by going to your App Dashboard and click on App settings.

It will take you to your app settings page, Then click on Keys and IDs tab.

It will show OneSignal App ID and Rest API Key.

Copy and paste them in OneSignal WordPress plugin's configuration tab on your site.