クレカ

くれか
noun
credit card (casual abbreviation)
informalcolloquialmoneyshopping
1. credit card; "credit card" shortened
A clipped form of クレジットカード. It belongs to casual speech, chat, and online writing; formal documents, shop signage, and staff speaking to customers all use the full クレジットカード.
クレカ(はら)
I'll pay by credit card.
Apparently that shop doesn't take credit cards.
When I looked at my credit card statement, I'd spent too much this month.

A clipping of クレジット + カード that keeps the front of each part, the same abbreviating pattern as スマホ (スマートフォン) and パソコン (パーソナルコンピューター).

Common collocations

Register

Casual only. Say クレジットカード in a shop, on a form, or in any business setting; クレカ is for friends, family, and informal writing.