WeChat itself does not support directly paying off credit cards for others. However, you can achieve this through the following methods:

1. Transfer: You can transfer money to your friends or family and let them pay off the credit card themselves. In WeChat, you can transfer money to other parties through the "Transfer" function.

2. Use a third-party payment platform: Some third-party payment platforms (such as Alipay, JD.com, etc.) provide credit card repayment functions. You can ask your friends or family to use these platforms to pay off credit cards.

3. Use a bank APP: Your friends or family can use their own bank APP to pay off credit cards. You can transfer money to their bank card and let them pay it back in their bank app.

It should be noted that when making transfers or repayments, please ensure that the identity information and credit card information of your friends or family members are correct to avoid errors or fraud. At the same time, when making large transfers, it is recommended to use safe payment methods and pay attention to protecting personal information.