The Authorize.Net Payment Gateway allows users to submit credit card payments without leaving the website.
Payment Description – used to describe the transaction between the Administrator and the Merchant.
Post URL - Specifies the URL used by the Authorize.Net payment provider to post payment transactions. This value should generally not be changed, except for testing or troubleshooting purposes.
Merchant Login ID - Your Authorize.Net API login.
Transaction Key - Your Authorize.Net transaction key.
Test Mode - When checked payments will be posted as test transactions. No money will actually be transferred.