Hey, is the AWS account you are using inside an organization? If it's then all the billing information should go into the management account. Hope this is the issue and I could help you.
* We need a way to serve image files.
* I create an organization account, add an S3 bucket.
* We serve images as our application grows.
* Fast forward a few months, get an email saying, we're at 85% of free-tier limit.
* I invite my boss to the Organization, and make her the financial contact.
* Neither I, nor my boss, have been able to figure out where, or how, to enter a credit card number.
* We continue to get monthly 85% limit emails. Following the link in the email leads nowhere where we could enter the payment info.
* What a completely insane and stupidly opaque UI. Take our money! How?
* Will probably move to a service that's better organized. We're just serving image files, a few hundred per day.
We have both tried and are unable to figure out how to tie payment info to our AWS organization.
Did you give your boss a Billing role in IAM, within the Organization master account?
If so, search for the “Billing” service and Payment Methods will be on the side.
If in doubt, use the root account, but do so only sparingly. You can use it to debug admin and billing permissions.