Authorize.net checkout is not configured — add credentials in Admin
Premium/role-plan checkout refused with the long message: add credentials in Admin → Settings → Payment and enable Authorize.net checkout.
Why this happens
Same root cause as the short Authorize.net checkout is not configured — this variant is returned from plan checkout with explicit admin guidance.
Diagnose and fix
1. Fill API Login ID + Transaction Key (or signature key as required); enable the gateway.
2. Save; hard-refresh checkout; retry.
3. Confirm the plan’s allowed payment methods include Authorize.net.
4. Distinct from Authorize.net is not available (card form client config load).