I see on First Data's Knowledge base that they want you to use this module:
http://schogini.biz/firstdata-global-gateway-e4-api-payment-module-for-oscommerce.html
Has anyone tried it on an older OSC? I have a client on v2.2 who is switching to First Data. Don't want to spend $57 if the module is a bust on v2.2...
Brad; my hero - 4 years later and your fix worked for me, too, on linkpoint_api.php, vers 67, Now I just need to find the post about turning off the dang CC Debug emails again but that's "happy" work in comparison :D