Note: Use a desktop PC or MAC for easier setup.
1. Make sure you are setup with an active account with with Square Payments. Use https://squareup.com/us/en If you are not setup with an account, then create one and make note of your user name and password for future reference.
2. Go to: https://developer.squareup.com/apps/
3. Make sure to make note of these three important items:
Location Id
Access Token
Application Id
You will then use them on the auction website settings to allow access for payments via Square Payments.