Permit2 support for ERC20 Terminals #57
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Adds Permit2 support to terminals to improve the UX. Users will no longer need to do two separate transactions (Approve and Pay/AddToBalance), instead they can use Permit2 to give approval in the same transaction.
(This only works if they have given the Permit2 contract approval to spend the tokens)
TODO:
uint256touint160(?)