You can remove your linked card(s) from your ShopBack account and the steps are simple.
a) Log in to your ShopBack App
b) Tap on the 'Account' on the bottom right
c) Tap on 'Add/Manage Payment Methods'
d) Click on the and tap 'Remove Card'
e) Double confirm the card you want to remove
f) Proceed with 'Remove Card'
g) You will see 'Card successfully removed from your account'