How to Integrate a Puppeteer CAPTCHA API: From Parameter Extraction and Token Injection to Troubleshooting Target Site Rejection

A complete guide to integrating a CAPTCHA recognition REST API with Puppeteer: dynamically extract parameters like sitekey, create tasks and poll results, inject tokens into the DOM via page.evaluate and trigger frontend callbacks, and troubleshoot the four common reasons a target site still rejects a returned token—expiry, callback not fired, IP mismatch, and automation fingerprint.