HubSpot Partner Attribution

A US cryobank runs landing pages for its partner fertility clinic networks, so that people coming through a clinic can create an account from a page made for that network. Signups from one partner network's page were meant to be recognisable in HubSpot, so the team could segment them and, where wanted, send onboarding written for that network. They were not: in HubSpot, a partner signup looked exactly like any other.

Two separate systems write to the same HubSpot portal. The main website creates contacts through HubSpot form tracking when someone signs up. A sister platform with its own backend creates contacts through the HubSpot Contacts API, upserting them by email. The working assumption was that the website behaved like the second: registration, then a backend sync that would set the partner property and trigger the right workflow.

We tested it. Registrations made through the partner landing page were traced with browser HAR logs and checked against each contact's property history in HubSpot. Every contact had been created by the signup form itself, and nothing updated it afterwards: no backend sync ran after registration. The promotion behind the landing page was known to the website's own system, with its ID, name and coupon code, but none of it reached HubSpot.

Rather than build a new backend integration, we added what the form was missing. A new HubSpot contact property records the clinic network, and a hidden field with the same internal name sits on the signup form. The partner landing page links to signup with the network in the URL, the form carries it into HubSpot, and the contact is created already tagged. Everything after that runs exactly as before: the account type, the existing welcome workflow, the backend step that sets the client type, and the branches that follow it.

We tested every way into signup from the partner page. The page's own Create Account buttons carried the tag through. Two links in the site header, one for the account and one for sign-up or log-in, sent people to signup without it. We documented both with the fix (separate log-in from sign-up, add the clinic network to sign-up links, and keep log-in out of the HubSpot sync), and the client's developers took the navigation change on.