Quick answer
On your HUAWEI ID tap Payment and purchases, then Bank cards, then the + at the top, fill in the card details and tap Confirm. You can also add a card directly on the payment screen inside a game.
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Step 1
Open Payment and purchases
On your HUAWEI ID page tap Payment and purchases.
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Step 2
Tap Bank cards
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Step 3
Add the card
Tap the + at the top of the page, fill in the required fields, then tap Confirm.
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Step 4
Or add it while buying
When buying in a game or app, tap Add bank card on the payment screen, fill in the fields and tap Pay. The card is saved automatically once the payment is done.