How to Add a New WordPress User to a Mailchimp Audience

Want every new WordPress account to land in your Mailchimp audience without exporting a CSV every month? Zapify does this with the free A user registers trigger and the Add or update a subscriber action. Mailchimp is a Zapify PRO integration.

What this automation does

The automation is one trigger plus one action:

• Trigger: A user registers (WP_USER_REGISTERED, WordPress)
• Action: Add or update a subscriber (MAILCHIMP_ADD_SUBSCRIBER, Mailchimp)

Whenever a new account is created, Zapify adds that person's email to the Mailchimp audience you choose — or updates their existing subscriber record if they're already in it.

Before you start

• A Mailchimp account with at least one audience.
• Your Mailchimp API key, from Mailchimp's account settings. Keys end in a server prefix such as -us21 — Mailchimp's own guide shows exactly where to find one.
• The Audience ID (Mailchimp calls it the List ID) for the audience you want to add people to — find it under Audience → Settings → Audience name and defaults.

How to build the automation

Step 1: Connect Mailchimp

1. Go to Settings → Connections and click Add New.

2. Choose Mailchimp, paste in your API key, and give the connection a name such as Newsletter Mailchimp.

3. Leave Server prefix empty unless your key doesn't carry one — Zapify reads it from the key automatically.

4. Save.

See Connections for how this screen works generally.

Step 2: Create a new automation

1. In the WordPress admin, go to Zapify → Automations.
2. Click Add New to open the builder.
3. Name it clearly, such as Add new users to Mailchimp.

Step 3: Add the "A user registers" trigger

1. Click Add Trigger.

2. Choose WordPress as the app.

3. Select A user registers.

Step 4: Add the "Add or update a subscriber" action

1. Click Add Action.

2. Choose Mailchimp as the app.

3. Select Add or update a subscriber.

Step 5: Configure the action

Field	Required	What it does
Connection	Yes	The Mailchimp connection you set up in Step 1.
Audience ID	Yes	The List ID of the audience to add the subscriber to.
Email address	Yes	Insert the trigger's User email token.
First name / Last name	No	Insert the trigger's name tokens if you have them.
Tags	No	Comma-separated tags to apply, such as new-user.
Status	No	Subscribed (default) adds them directly. Pending sends Mailchimp's own double opt-in confirmation email instead.

Step 6: Set the steps Live and save

1. Set both the trigger and the action to Live.
2. Click Save.

Step 7: Test it

Register a test account with an email address you control. Check that address in your Mailchimp audience within a minute or two, or open Zapify → Logs to confirm the run and see the HTTP status Mailchimp returned.

Tokens you can use

The A user registers trigger exposes these tokens for the action's fields:

Token	Value
User email	The new account's email address.
Display name / First name / Last name	Name parts, if set.
Username	The login name.
Registration date	When they registered.

Conclusion

With the free A user registers trigger and the Add or update a subscriber action, Zapify keeps your Mailchimp audience current without a manual export. Combine it with a welcome email in the same automation, or notify your team in Slack when a product is purchased.

FAQs

Is this free in Zapify?

The trigger is free. Add or update a subscriber is part of the Mailchimp PRO integration and needs an active Zapify PRO licence and a Connection.

What happens if the person is already subscribed?

Mailchimp updates their existing record instead of failing — the action addresses subscribers by their email, so running it again for the same person is safe.

Where do I find my Audience ID?

In Mailchimp, go to the audience, then Settings → Audience name and defaults. Mailchimp calls it the List ID there.

My connection fails with a server-prefix error. What does that mean?

Every normal Mailchimp key ends in a datacentre suffix, like -us21, and Zapify reads it from the key automatically. If your key doesn't carry one, add it explicitly in the Server prefix field on the connection.

Can I add tags automatically, like "new-user"?

Yes, using the action's Tags field — comma-separate several if you need more than one.

Do I need to write any code?

No. The connection and every field are configured visually — the API key is the only thing you copy from outside Zapify.