Congrats -- but keep in mind that being a GSA is one of the most stressful positions. You have the same responsibilities as a GSTL, but get paid a lot less. I heard you are a paygrade 8, and start in the $9/hr range-- not much higher than a cashier.
GSA seems to be one of the most under-paid, under-appreciated, and over-worked position at my current store. I'm hoping it is different at the store you are interviewing with! I once thought I wanted to be a GSA, but having covered them during breaks and lunches on a regular basis lately I have changed my mind. It would take a lot more than a 50 cent an hour pay raise to make me put up with what they have to deal with!