Quick fixes for the most common API errors.
Authentication errors
401 Unauthorized
Cause: Invalid or missing API key
Fix: Check your API key is correct and included in the Authorization header
403 Forbidden
Cause: API key doesn't have permission for this action
Fix: Upgrade your plan or check API key permissions
Request errors
400 Bad Request
Cause: Invalid email format or missing parameters
Fix: Validate email format before sending
422 Unprocessable Entity
Cause: Email is valid format but cannot be processed
Fix: Check the specific error message for details
Rate and quota errors
429 Too Many Requests
Cause: Rate limit exceeded
Fix: Implement backoff and retry, or upgrade plan
402 Payment Required
Cause: Out of credits
Fix: Purchase more credits or upgrade plan