happy

The project is an API client library, shifting primary security responsibilities (API key storage, input sanitization) to the consuming application. API keys are passed in query parameters or headers, which is standard but requires HTTPS for confidentiality. The C++ client includes a local TCP ReplyServer for OAuth redirect handling, which, while standard, needs careful implementation to prevent local network vulnerabilities. URL parameter substitution uses regular expressions, which could be a ReDoS vector if server variable values were untrusted, but they are typically fixed configuration. There are no obvious hardcoded secrets or malicious patterns in the provided truncated code.