generated: '2026-07-18'
method: searched
source: https://help.leminnow.com/knowledge/verification-result
description: >-
  Error/result code registry for the Lemin Captcha Verification API. The
  verification endpoint always responds HTTP 200; the outcome is carried in a
  JSON envelope, and failures include a machine-readable code and human-readable
  message. This is not RFC 9457 problem+json — it is Lemin's own compact result
  envelope.
format: custom-envelope
envelope:
  content_type: application/json
  fields:
    success: boolean — whether verification succeeded
    message: string or null — human-readable failure description
    code: string or null — machine-readable failure identifier
  http_status: 200 for all responses (success and failure)
error_codes:
- code: incorrect_answer
  message: Incorrect Answer
  meaning: The submitted answer did not solve the challenge.
  remediation: Ask the visitor to retry the puzzle.
- code: invalid_parameters
  message: Invalid Parameters
  meaning: One or more required fields (private_key, challenge_id, answer) are missing or malformed.
  remediation: Verify all three fields are present and valid JSON with content-type application/json.
- code: invalid_challenge_id
  message: Invalid challange_id
  meaning: The challenge_id is not recognized.
  remediation: Use the challenge_id returned by the client-side widget for this session.
- code: invalid_private_key
  message: Invalid private_key
  meaning: The account private_key is not valid.
  remediation: Use the private (account) key from the Lemin Dashboard; keep it server-side.
- code: challenge_is_not_active
  message: Challenge Is Not Active
  meaning: The challenge has expired or was already consumed.
  remediation: Generate a fresh challenge; do not reuse or delay verification.
- code: invalid_cropped_captcha
  message: null
  meaning: The cropped-captcha payload is invalid.
  remediation: Ensure the widget-produced answer is passed through unmodified.