How’s That Declared?

There’s a mini-scandal with Gov.-elect Rick Scott down in Florida tied to one of his campaign workers who says he was compelled to accept his pay in Amex gift cards. The story is being played as one of his somehow being abusive toward his short-term campaign workers. But TPM Reader BP notes maybe this is more a campaign finance issue than that. Why does the campaign have a bunch of Amex gift cards around? Where are they from? How were they paid for?