Form integrations

Connect your forms to email marketing platforms and webhooks. Select an integration in the Form settings panel, enter your credentials, and you're ready to collect submissions.

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Webhook

Send raw form data to any URL.

You will need:

• A publicly accessible HTTPS endpoint

Setup:

1. Create or use an endpoint that accepts JSON POST requests (your own server, Zapier, Make, etc.).
2. In the integration panel, select Webhook and paste the URL.

How data is sent: The form fields are sent as-is in a flat JSON body. Field names in the JSON body match the "Name" value you set for each field in the Form settings.

{ "email": "[email protected]", "name": "Jane" }

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Loops

Subscribe contacts to Loops.

You will need:

• API key

Where to find it:

1. Log in at app.loops.so.
2. Go to Settings > API, and generate a new API key or copy an existing one.

How data is sent: All form fields are forwarded as contact properties. When a field name doesn't exist yet in Loops, a new property column is created automatically — so we recommend to keep your field names consistent.

Reference: Loops API docs

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Mailchimp

Add subscribers to a Mailchimp audience.

You will need:

• API key
• Server prefix
• Audience ID

Where to find them:

1. API key — Account > Extras > API keys. Generate one if you don't have it.
2. Server prefix — The part after the dash in your API key. For example, if the key ends with -us6, the prefix is us6.
3. Audience ID — Audience > Settings. The ID is displayed on that page.

How data is sent:

The email field is used as the subscriber email address. Every other field is sent as a merge field, where the field name must exactly match a merge tag in your Mailchimp audience (case-sensitive).

Every Mailchimp audience includes these merge tags by default:

Form field name	Mailchimp merge tag	Saved as
email	—	Subscriber email address
FNAME	FNAME	First name
LNAME	LNAME	Last name
PHONE	PHONE	Phone number
ADDRESS	ADDRESS	Address

You can add custom merge tags in Mailchimp under Audience > Settings > Audience fields and *|MERGE|* tags. Use the tag name (e.g. COMPANY, PHONE) as the form field name to send data to it.

If a form field name doesn't match any merge tag in the audience, the Mailchimp API will reject the submission.

Reference: Add member to list — Mailchimp Marketing API

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HubSpot

Create contacts in HubSpot CRM.

You will need:

• Service key

Where to find it:

1. In your HubSpot account, go to Settings > Integrations > Service Keys (or Development > Keys > Service Keys).
2. Click Create service key, give it a name, and add the crm.objects.contacts.write scope.
3. Copy the generated key.

How data is sent: Some common field names are mapped automatically:

Your form field	HubSpot property
name, first_name, firstName	firstname
last_name, lastName	lastname
phone	phone
company	company
website	website

Everything else is passed through using the field name as the HubSpot internal property name. Make sure the property exists in your HubSpot account.

If the contact already exists, the duplicate is silently ignored.

Reference: HubSpot Contacts API

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Beehiiv

Subscribe readers to a Beehiiv publication.

You will need:

• API key
• Publication ID

Where to find them:

1. API key — In your publication dashboard, go to Settings > API and create a key.
2. Publication ID — Shown in the same API settings section, or in the URL of your dashboard.

How data is sent: Only the email field is sent. Other form fields are not forwarded to Beehiiv.

Reference: Beehiiv Subscriptions API