Hi Chua Shan Jing,
Welcome to Microsoft Q&A, Thanks for asking question here!
Steps to Remove Payment Method
- Sign-in to the azure portal and navigate to cost management + billing.
2.Under the Billing section, click "Billing profiles."
3.Choose the billing profile with the payment method you want to remove.
4.Click "Payment methods" in the left menu.
5.Find the credit card you want to remove.
6.Click the ellipsis (...) next to it and select "Delete." 7.If the card can't be deleted, check if any active subscriptions or charges are preventing it.
8.If deletion is allowed, confirm by clicking "Delete" in the confirmation window.
Reference link: https://zcusa.951200.xyz/hi-in/azure/cost-management-billing/manage/change-credit-card
Please let me know if anything required!