Creat a Harvester in your Tools Tab the same way you normally would. Select the Harvester and change it to google-pay-gen and hit Save.

Hit the YouTube Button and sign into your Gmail Account. Once signed in you will be prompted to add a payment method.

Once your done with that you can close that window and hit the Open button to bring up your harvester. Then click the Kith button.

You will be brought to the Kith website. navigate and add an item to your cart. Then select the Gpay Button.

You will be brought to the checkout page. You may have to add a phone number before it will let you checkout (Phone number does not have to be real). Then just scroll to the bottom and hit Pay. You should see the following Image:

Once that's done just toggle Gpay on your Kith tasks and your done. Gpay tokens are only good for 7 days so make sure you refresh them weekly.