Use this resource “How to Set Up Authorize.net Payment Gateway” at Redstage’s Magento Blog for more information on how to set up the Authorize.net payment module in Magento. The article shows where to get the API and Transaction Keys, as well as where to enter them into Magento.
As with most payment gateways, the steps involved are a matter of:
- Gathering the appropriate information (provided by the gateway service)
- Enter the information into the Magento Admin Panel
- Activate the payment module
