How to Integrate GeeTest CAPTCHA Recognition API: Dynamic Parameter Extraction, Single-Flow Anti-Reuse, and Result Backfilling in Practice
For GeeTest v3/v4 verification scenarios in automated testing and public data collection, this article explains how to intercept dynamic initialization parameters, avoid challenge reuse, obtain verification credentials via NexCaptcha API, and complete frontend callback injection or direct business interface submission.
GeeTest v3 vs v4: Differences in Initialization, Parameters, Secondary Validation, and Automation Integration Architecture
GeeTest v3 and v4 are two independent architectures: v3 requires server-generated dynamic challenge, client initialization with gt and challenge, and returns validate and seccode; v4 removes request stickiness, uses static captcha_id, introduces adaptive verification, and returns lot_number, pass_token, captcha_output, and gen_time, with server-side HMAC-SHA256 validation.
