reCAPTCHA v2 vs v3: Interaction, Backend Verification, and Automation Handling

reCAPTCHA v2 requires user interaction and returns only pass or fail; v3 is unobtrusive and returns a 0.0–1.0 risk score plus an action label, with your backend deciding whether to allow. This article compares the two in terms of frontend behavior, siteverify responses, token rules, selection, hybrid solutions, and automation handling, and lists common pitfalls during implementation.