Follow these steps to set up payment information for Amazon Advertising:

  1. Sign in to your Amazon Advertising account.
  2. Click on the "Settings" tab at the top of the page and select "Account Information" from the drop-down menu.
  3. Under "Payment settings," click the "Add payment method" button.
  4. Select the payment method you want to use, such as a credit or debit card, a bank account, or Amazon Pay.
  5. Enter the required payment information, such as your card number, expiration date, and security code, or your bank account number and account number.
  6. Review the information you have entered and click the "Save" button.
  7. Once you have saved your payment method, you can set it as your default payment method by clicking the "Make default" button next to the payment method.

It is important to note that Amazon Advertising requires a valid payment method before you can create campaigns. Also, make sure to keep your payment details up to date to ensure that your ads continue to run without interruption. If your payment method does not work or is declined, your campaigns will be paused until you update your payment details.