Sorry, we have no way to add support for a new payment processor from your front-end side of things, and our back-end codebase is proprietary and not available for release.
Honestly, adding support for a new payment processor is one of the most difficult and complicated tasks we can undertake, even knowing our code intimately ourselves, and some payment services just cannot be integrated well or at all -- e.g., note how we can only offer Buy Now buttons for ClickBank and 2CheckOut, which won't work with any of our cart-based features at all.
For these reasons, we don't take lightly the prospect of adding support for a new payment processor and have to consider whether the effort invested would be of enough benefit to a broad enough base of sellers using our service. The processors on Development's "short list" as likely candidates for future integration would be those with the broadest international support, as we already support plenty of alternatives for US-based sellers.
