To delete a bank card from WeChat Pay, you can do the following:

 

1. Select Me
2. Select Pay and Services
3. Select Wallet
4. Select Bank Cards
5. Select the card you want to remove
6. Select the ... menu in the top right corner
7. Select Unlink at the bottom of the page 

You can also cancel your WeChat Pay account, which will unlink all linked bank cards:

1. Log in to WeChat
2. Select Me
3. Select WeChat Pay/Pay
4. Select the ... menu in the top right corner
5. Select Cancel WeChat Pay
6. Follow the instructions to cancel your account 

Deleting your WeChat account will also unlink all linked bank cards and clear all account information. Once deleted, your account information cannot be recovered