Doudian Showcase is an e-commerce tool launched by Douyin, which can help merchants open stores and sell on Douyin. If you want to accept bank card payments on Doudian Showcase, you need to bind it first. The specific steps are as follows:

1. Open the Doudian Showcase APP, go to the "My" page, and click the "Settings" button.

2. On the settings page, find the "Payment Settings" option and click to enter.

3. On the payment settings page, find the "Bank Card" option and click "Bind Bank Card".

4. Enter your bank card number, name, ID number and other information, then click "Next".

5. According to the prompts, enter the verification code and confirm the binding.

After the binding is successful, you can accept bank card payments on Doudian Showcase. Please note that binding a bank card requires certain conditions to be met, such as real-name authentication, etc. The specific requirements can be viewed on the binding page.