Note that a card can't be restored after you delete it. To delete a bank card, follow these steps:
1. Go to the Main tab in the bottom navigation bar
2. Choose a card that you want to delete and tap to open its details
3. Tap the three dots button in the upper right corner of the screen and select Delete.
Done! This card is no longer available in Swoo.
If you want to disable payments for a card but still keep its details in Swoo, check this article: How do I disable payments for a bank card?