To switch credit cards on my ShinePay account,  follow the steps below. 

1. Tap on the + button on the upper left corner of ShinePay app's  home screen:

2. Swipe left on the credit card you are removing and click on the delete button that will appear on the right side:

3. Click on the Delete button to remove the card:

4. Add the new credit card, click here for the guide on how to add credit card 

Here is a demo showing how to switch credit cards on my ShinePay account: