Step #1: Logging into ShopsiteBefore you can configure the AuthorizeNET payment gateway within your Shopsite you need to first be logged into its web based interface. Depending on your hosting provider you will have been given access information in order to login. If you do NOT have this information, get it from you host.

Once you have logged into your Shopsite back office you will be presented with a screen just like the one displayed above.
Step #2: AuthorizeNET Payment Information for ShopsiteGo to
www.authorizenet.com
Click the Merchant Login button.

Enter your AuthorizeNET login and password information.

Click the Log In button.

Locate the Account section of the screen.

Click the Settings link.

Locate the Security Settings section of the screen.

Click the API Login ID and Transaction Key link.

Write down the API Login ID either on a piece of paper or in digital document, i.e. Notepad.

During the setup of your AuthorizeNET account you would have been asked to setup a Secret Question along with an Answer to that question. Enter you answer in the Secret Answer field.

Check the Disable Old Transaction Key(s) check box.

Click the Submit button.

Write down the Current Transaction Key either on a piece of paper or in a digital document, i.e. Notepad.
Step #3: Configuring Shopsite with the AuthorizeNETClick the Commerce Setup button.

Click the Payment button.

Scroll till you reach the Credit Card Processing section of the screen.

Select the Authorize.Net radio button.

Click the Configure Processor button.

Enter the API Login ID in the Login ID field.

Enter the Transaction Key in the Transaction Key field.
Step #4: Saving Your ChangesConfigure the remainder of the settings to your liking and once done click the Save Changes button.

This concludes our tutorial on how to setup the Shopsite shopping cart with the AuthorizeNET payment gateway.