How do i Change/Update/Clear Credit Card Details information/Number of Android Phone Market Place
On your PC. Log in to Google Wallet (previously Google Checkout). Use the same Google/Gmail login you used for your android phone.
Go to Web: https://wallet.google.com/manage/#paymentMethods:
You can delete, edit or add a new card here!
To see your android phone Order (Applications downloaded) and Device settings go to Web: https://market.android.com/account
Hope this helps,
Have great purchase ^^