To use this feature, you must already have an Authorize.NET account.

To sign up for Simple Checkout, you must have activated the Multiple User Accounts feature, accepted the Simple Checkout Terms of Service and generated a Transaction Key for your account. If any of these steps have not been completed, you will not be able to begin creating your Buy Now or Donate buttons.
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After clicking Simple Checkout under Tools in the main menu on the left, you will be prompted to complete the steps you have not completed. After completing each step, you need to click Simple Checkout to navigate back to this page. Once all three steps have been successfully checked off, you can click Simple Checkout again, and you will be taken to the Simple Checkout Administration Page to begin creating Buy Now or Donate buttons.