Add or update a contact in HubSpot when a contact joins a list in Brevo

What each client fills in

Brevo: List ID

Contacts → Lists: the number beside the list’s name.

The accounts it needs

Each is the client’s own, stored encrypted and never copied between clients. Until one is added the client’s checklist shows it, and nothing runs.

• Brevo

  In the client’s Brevo: account menu → SMTP & API → API Keys → Generate a new API key.

• 

  In the client’s HubSpot: Settings → Integrations → Private Apps (Legacy apps) → Create → scopes crm.objects.contacts.write, and for the triggers crm.objects.contacts.read, crm.objects.deals.read and tickets → copy the access token. A private app needs no HubSpot review.

After you install it

It lands switched off. The client’s checklist holds exactly this:

1. Connect the client’s Brevo, for “A contact joins a list”
2. Connect the client’s HubSpot, for “Add or update a contact”
3. Fill in Brevo: List ID (Contacts → Lists: the number beside the list’s name)