As a user with many domains, I would like to be able to renew multiple domains simultaneously in a single financial transaction. This appears to not be possible in the current system.
The workaround is to total up what you will be spending on your domain registrations and renewals. then “make a payment” on your account. That will give your account credit, which then allows you to run right thru multiple renewals since they are using up the credit on your account and do not require the payment screen.