credit card
Kreditkarte is the German term for credit card. It is a payment card issued to users to enable the cardholder to pay a merchant for goods and services based on the cardholder's promise to the card issuer to pay them for the amounts plus the other agreed charges. The card issuer (usually a bank) creates a revolving account and grants a line of credit to the cardholder, from which the cardholder can borrow money for payment to a merchant or as a cash advance to the cardholder.
I lost my credit card.
This sentence in present perfect, often used to express something that happened in the past but has impact on the present. In this context, the speaker has lost their credit card and it is assumed they still haven't found it.
Can you accept the credit card?
This sentence is used to ask if a credit card is an acceptable form of payment. The modal verb 'können' (can) is used to form polite requests or offer suggestions.
The credit card was declined.
This sentence uses passive voice to indicate that an action was performed on the credit card (it was declined). Passive voice is often used in German to shift the focus from the 'doer' of an action to the action itself.