One who charges purchases

• Rewards earner, perhaps

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ Among the biggest losers was Barclaycard, which paid out £600,000 to cardholders who used their plastic to buy bonded spirit. ▪ For cardholders, it often means the chance to help support an organization every time they charge ...

Wiktionary Word definitions in Wiktionary
n. 1 A case for holding cards, as credit cards, bankcards, or business cards. 2 An authorized user of a card used for financial transactions.