charge plate
noun
an identification plate, especially one from which an impression can be taken, issued to a customer and used to make purchases on a credit basis.
Also charge-a-plate.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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Historical Examples of charge plate
They were approaching the exit when Sammy spotted a charge-plate for the robots.
MakersCory Doctorow