Your Zoho Projects integrations have a use-by date. All pre-V3 endpoints are retired on 31 December 2025, and legacy calls will fail from New Year’s Day. This guide explains what’s actually changing, the hidden pitfalls that catch teams out (auth, payloads, pagination), and the practical steps to move to V3 without downtime. Includes a migration checklist, FAQs and an action plan you can implement this week—plus how Ascent can handle the cut-over end-to-end.