Coinbase Commerce checkout is not configured
Plan, traffic, or reseller top-up selected Coinbase Commerce while it is not ready (balanceTopUp.coinbaseNotConfigured / 503).
Why this happens
Toggle off or credentials incomplete. Same family as BTCPay/Authorize.net short “not configured” strings.
Diagnose and fix
1. Enable Coinbase Commerce checkout; add API key (and webhook as needed).
2. Retry the purchase; member should redirect to hosted Coinbase checkout.
3. Offer BTCPay / NOWPayments / card if Coinbase is not intentional.
4. Longer sibling: Coinbase Commerce checkout is not enabled — add API credentials.