Hi there @HDilloway
Thanks for reaching out — I can see why this is urgent if leads are getting dropped when a contact already exists.
I’d like to invite some community members who are subject matter experts in HubSpot APIs and contact upserts to join this conversation.
@BrandonWoodruff @evaldas @kosalaindrasiri — hope you’re all having a great week! Can you share the best-practice way to change a create-only flow (POST) into an update-or-create pattern (PATCH/upsert) for contacts, and what endpoints/payload structure they should use to avoid duplicates and failed lead creation?
Any guidance would be greatly appreciated.
Best,
Victor