I introduced my wife to the true definition of "hacking”:
Tried to use EcoBici in Mexico City. It would not even charge our credit cards and just gave a generic "something was wrong” notice - not even a decline!
Knowing that to charge a card, AT MOST the card info + zip + street address is sent (not country nor state/province), we changed our country to Mexico, but used our US street and zip. Worked like a charm.
And then we biked all week!