ETYM Old Eng. walet, probably the same word as Old Eng. watel a bag. Related to Wattle.
A case for holding paper money; SYN. billfold, notecase.

In electronic commerce, a software program that contains a user’s address and credit card information for use in paying for online purchases. When the wallet is opened at the electronic checkout, it identifies the user to the merchant’s server and allows the user to authorize the appropriate debit to a credit card.