A pleased paid user (thanks to WaffleMaster for vouching)!  Seller is very easy to talk to as well as helpful.

Edit: A proper go at this method to come this weekend (not enough caffeine in my system atm - if only I had Starbucks - *appears to be caught in a chicken and the egg scenario*), but as WaffleMaster stated, it does appear to be solid and is zero/low-risk on your part.

Edit 2: No luck so far (although Starbucks response system seems to be very slow/possibly faulty atm).  I will talk with the seller when possible this week to see if I'm leaving out a critical step (which if so, might help others out).

Edit 3: Apologies for the long delay between updates.  I was able to receive a $25 credit (I was hoping for 2x that but I may make another attempt since it'd be nice to at least break even).