Need Help with osCommerce Payment Module

I'm setting up an e-commerce site based entirely on osCommerce. Everything is fine but towards the end I've reached a snag with the payment modules. Another site I made, based in North America, work perfectly because I could use authorize.net as a payment gateway (which is incorporated in osCommerce). Now I'm in South America (to be exact, in Lima - Peru) and authorize.net is not available down here and I can't find any other similar setup.

I need to set it up so it will accept VISA credit cards. I'm not a programmer, just a web designer, but have dealt with some PHP.

If anybody can be of help in showing me the way, it will be greatly appreciated.

TIA

 

Yes, there are a bunch of addon payment modules...but I can´t seem to find one that is specific for my needs.

Maybe I'll have to settle for Google Checkout or something similar.

Thanks