我只有一张信用卡。

Wǒ zhǐyǒu yì zhāng xìnyòngkǎ.

I only have one credit card.

我可以用信用卡付钱吗？

Wǒ kěyǐ yòng xìnyòngkǎ fùqián ma?

May I pay with a credit card?

用信用卡付钱又快又方便。

Yòng xìnyòngkǎ fùqián yòu kuài yòu fāngbiàn.

Paying by credit card is fast and convenient.