Idea: They have cards at the counter at Starbucks and if you took these, registered them (With phony info) and used them for a free birthday coffee would this work or do they need activated over the counter? I have an actual Starbucks card and had to register online and think they would just scan like normal.
If this works enjoy free coffee
PS: Most stores have the cards just sitting about
Protip: Don't use them at the same store more than once a month and NEVER with the same employee, especially if you use the store often.