Authorize.net 
1Log in to Authorize.Net merchant account
2Click Settings on the left menu
3Under the 'Transaction Response' group click Relay Response

You should now be presented with a screen containing the following:

4You should now enter the following URL, adjusted to your forum:

https://www.example.com/forums/payment_gateway.php?method=authorizenet

Click [Submit]
5You should now be on the main Settings screen again, click 'Obtain Transaction Key' under the Security group. Enter the appropriate secret information and a new key will be generated for you.
Note:
If you already know your transaction key you dont need to generate a new one.
6To set the Login ID and transaction key go to Paid Subscriptions > Payment API Manager > Authorize.Net in your vBulletin AdminCP where you will presented with the following page:

7Complete the Authorize.Net Login ID and Authorize.Net Transaction Key with your login for Authorize.net and the transaction key that you have generated in the relevant fields.
8If you have a MD5 Hash Security Key for your Authorize.net account, then you can enter it in the MD5 Hash Security Key field. This is not a required field, so if this field is not completed then it will not affect the operation of the paid subscriptions.
9Finally, to activate Authorize.Net payments, change the Active setting to Yes.
Note:
Authorize.Net does NOT support recurring payments.
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