To activate the Transparent Database Engine:

In ISN, go to Settings --> Office Settings --> Payment Options. Scroll down to eProcessingNetwork and activate this setting: 

Be sure to hit "Save" at the bottom of the page once you activate it.

Next, we need to make sure your EPN is setup to work under the TDBE:

Login to your eProcessingNetwork account here: https://www.eprocessingnetwork.com/msclogin.html

Next, navigate using the below screenshots: 

Once this is done, your ISN will process EPN transactions under EPN's native engine TDBE, which has better support for refund and void transactions.

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