unsupported_plan_transition

{
  "type": "https://developer.hostup.se/errors/unsupported_plan_transition",
  "title": "Plan change unavailable",
  "status": 409,
  "detail": "Reseller hosting changes require a separate account migration. Contact support to make this change.",
  "code": "unsupported_plan_transition",
  "instance": "/api/v2/...",
  "requestId": "req_abc123",
  "timestamp": "2026-04-27T12:00:00.000Z"
}

const response = await fetch(url, options);

if (!response.ok) {
  const problem = await response.json();

  if (problem.code === "unsupported_plan_transition") {
    // Handle: Plan change unavailable
    console.error(problem.detail);
  }
}