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Authentication Errors

All goLance API endpoints require a valid OAuth 2.0 access token. If the token is missing, invalid, or expired, the API responds with a 401 Unauthorized status and a JSON error message: 
{
  "error": "invalid_token",
  "message": "Invalid token: access token is invalid"
}

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Expired Token

If your access token has expired, you must generate a new one. See Create Access Token for instructions on how to obtain a new token.

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Invalid or Missing Token

If you receive the same error even with a token, verify that:
  • The token value is correct and complete.
  • The token has not been revoked or replaced. If necessary, request a new one using the same authentication process.

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Server Errors (5xx)

If the API returns a 5xx status code (for example 500 Internal Server Error), it means that an unexpected error occurred on the goLance servers.
These errors are usually temporary. Recommended handling:
  • Retry the request after a short delay (for example, 5–10 seconds).
  • If the error persists, contact goLance Support and provide the request details (endpoint, timestamp, and response body if available).