We're not quite sure what you mean? Authorize.Net is just a payment gateway, which is basically the online equivalent of an in-store card-swipe/keypad terminal.
Authorize.Net needs to be used with a separate "merchant account", which is a type of bank account that allows you to authorize and accept card-based payments directly into that account's balance (rather than using a "middleman" type of payment processor such as PayPal or Google Checkout, where the buyer actually pays them, and then they in turn pay those funds to you).
Some Authorize.Net resellers provide merchant accounts that work with Authorize.Net, and these should work fine to accept checkout payments for our service. Other resellers may provide a shopping cart service like ours that can handle checkouts using Authorize.Net, or others may provide post-checkout order fulfillment or processing services, and these really just duplicate what we already do and thus would have no purpose if you're using E-junkie.
In fact, E-junkie itself is an Authorize.Net reseller, so of course we'd prefer you sign up for Authorize.Net using our own Reseller link, if you'd like to kick a cut of your Authorize.Net service fees back our way. :^)