Requiring a Zero Balance for Registration

What it does
When enabled, account holders with any outstanding (overdue) invoice balance
will be blocked from registering additional members until their balance is
paid in full.

How to enable it
1. Go to Setup / Registration
2. Under the registration options, check Require zero balance for registration
3. Save your changes

What the account holder sees
If an account holder with an overdue balance attempts to register, they'll be redirected to a notice explaining they have an outstanding balance, with a link to go directly to Billing to pay it off, and a Contact Us link if they
have questions.

How it differs from "Requiring Successful Payment to Confirm Registration"
- **Requiring Successful Payment**: blocks a *specific* registration from being
 confirmed until *that* registration's payment succeeds.
- **Requiring a Zero Balance**: blocks *any new* registration from starting at
 all if the account already has an *existing* unpaid balance from a prior
 invoice.

These settings can be used independently or together.