Authorize.net is not configured
Server-side authorize-net-api returned Authorize.net is not configured. before calling the gateway (missing API login / transaction key in settings).
Why this happens
Lower-level check used by charge, void, and related helpers. Same admin fix as checkout-not-configured, but this exact string is from the API client layer.
Diagnose and fix
1. Admin → Settings → Payment → Authorize.net — save credentials; enable features you need.
2. Retry the payment or admin operation.
3. Sandbox vs production: use matching keys and endpoints.
4. Related checkout strings point members to the same settings page.