Step 1: Tap "Auto Top-up" on the Card Details page
Step 2: Tap "Change"
Step 3: Select the new payment method and tap "Confirm"
Step 4: An authorisation amount will be held on the selected bank card. Tap "Proceed". 
And you're done!
Step 1: Tap "Auto Top-up" on the Card Details page
Step 2: Tap "Change"Step 3: Select the new payment method and tap "Confirm"
Step 4: An authorisation amount will be held on the selected bank card. Tap "Proceed". And you're done!