So the processing computer/database for the gift cards is in-house and on your network? If it's on your network you can access it using a database call. If not you'll have to use transmit and receive events, and a listener will have to be written and put in waiting on the processing server. [pre][/pre]
SIM, (ISL), doesn't have any built-in gift card functionality. It's a scripting language, like perl or vbscript. You have to write all the procedures from scratch and link it to POS Operations through events or inquiries.