2Checkout 
1Log in to your 2CO account
2On your Account Homepage, scroll down to the "Helpful Links" section of the page. Locate and click the "Products" link to go to your "Products List" page.
3Choose an existing product or create a new one. Note Your Product ID for the product that you wish to add a subscription for within vBulletin.
4Next you need to associate the subscriptions that you have in your 2CO account with your vBulletin subscriptions. Go to Paid Subscriptions > Subscription Manager. Choose an existing subscription or create a new one. You must enter the Product ID from the previous step into the 2CO Prod ID field. If you create multiple 2CO subscriptions you can enter them all into one vBulletin subscription or you can create multiple vBulletin subscriptions for each 2CO subscription. You should match the cost to the value you chose for your 2CO subscription.

5Go to Paid Subscriptions > Payment API Manager > 2Checkout where you will be presented with the following page:

6Enter your 2Checkout Vendor ID Number and 2Checkout Secret Word in the fields provided.
7To activate payments using 2CO change the Active setting to Yes.
Note:
2Checkout does NOT support recurring payments.
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