To Link a Bank Card:
Tap「Me」>「Pay and Services」>「Wallet」>tap「Bank Cards」> Tap Add a Bank Card and follow the instructions to link your credit or debit card.
To Unlink a Bank Card:
1. Tap「Me」>「Pay and Services」>「Wallet」>tap「Bank Cards」
2. Select the card you want to unlink and tap it to open the detail page
3. Tap the 「...」 menu in the top-right corner.
4. Tap Unlink at the bottom of the page to remove the bank card.