member's card; membership card
A card issued to members of an organization, store, or service, often used for identification, discounts, or point accumulation.
この店で割引を受けるには、メンバーズカードが必要です。
You need a member's card to get a discount at this store.
メンバーズカードをお持ちですか？
Do you have a membership card?
Variant with an interpunct; less common in everyday use but seen in formal or design contexts.
Borrowed from English 'member's card', adapted into katakana.