Cause

Payment processor (PSP) is temporarily unavailable.

Partner action

Retry with exponential backoff. Listen for deposit.status_changed webhook.

Gando action (internal)

Check PSP health, feature flags, and gateway availability.

Example response

{
  "error": {
    "code": "payment_processor_unavailable",
    "message": "Payment processor is unavailable",
    "requestId": "req_abc123"
  }
}