Mailchimp + HubSpot integration

Plandalf does not sync Mailchimp with HubSpot. A Plandalf sequence can do two things from one purchase: run native Mailchimp steps, and call HubSpot's contacts API with a Send Webhook step. A HubSpot workflow can post to a Plandalf catch URL to start a sequence in return.

1. Connect Mailchimp

   In Automation, then Marketplace, connect Mailchimp with the full key including its data-centre suffix. Create any merge fields you plan to fill in the audience settings first.

2. Create the HubSpot private app

   In HubSpot create a private app, give it the scope for writing contacts and copy its access token. HubSpot's authentication guide shows the token is sent as Authorization: Bearer plus the token.

3. Create the sequence

   Under My Sequences choose Plandalf, Checkout Completed and the offer, then pick a sample checkout on the Test tab.

4. Add Mailchimp steps

   Add Add or Update Contact and Add Tags to Contact. Use {{trigger.customer_email}} for the email and {{trigger.customer_first_name}} for the first name.

5. Add the HubSpot upsert

   Add Send Webhook with POST to HubSpot's contacts batch upsert path and the Bearer header. In the payload put one entry in inputs with the email as id, idProperty as email, and properties for firstname and lastname.

6. Test with your own email

   Run the tests, then look for the contact in both tools. Turn on Run on test purchases to rehearse the full path with a test card, and switch it off afterwards.

• HubSpot's own page warns that partial upserts are not supported when email is the identifying property, so send every property you care about in the same call.
• HubSpot's workflow webhook action is listed under the Data Hub Professional and Enterprise subscriptions in its knowledge base, and Plandalf's older HubSpot page names a different tier. Check HubSpot's current plan page for your account.
• The upsert needs a private app token, and Plandalf has no HubSpot connection screen. The token lives in the Send Webhook headers.
• Mailchimp does not create a missing merge field when a value arrives, so a mistyped merge tag fails that Mailchimp step. Put the HubSpot call in the sequence before it if you want the CRM record regardless.
• No one-way copy of existing contacts happens. Only buyers and new subscribers after the sequence is on reach the other tool.

Does Mailchimp integrate with HubSpot?

Plandalf does not integrate them with each other. It can run native Mailchimp steps and a HubSpot contacts API call from the same checkout. For a direct connection, check each vendor's own integrations pages.

How do I connect Mailchimp to HubSpot?

Through Plandalf, connect Mailchimp under Automation and add a Send Webhook step that upserts the contact in HubSpot with a private app token. The recipe above has the field values.

Mailchimp HubSpot integration for buyers: what gets created?

In Mailchimp the buyer becomes a contact in your audience with tags, and optionally an event. In HubSpot the contact is created or updated by email with the properties you send.

Can HubSpot start a Plandalf sequence?

Yes, with a workflow that posts to a Plandalf Webhook Trigger catch URL. HubSpot documents the action for workflows on certain paid plans, so check yours.

Checked October 26, 2026 against Plandalf's own setup guides and the vendor documentation: HubSpot developer docs: contacts API, HubSpot developer docs: private apps, HubSpot knowledge base: webhooks in workflows.