Connect Fluent Forms. Send every lead to MailerLite.

Connect Fluent Forms to MailerLite

Connect Fluent Forms to MailerLite through a native Fluent Forms integration feed. The free ClickSyncr for MailerLite plugin registers a MailerLite module in Fluent Forms: enable it, save one global API key, then add a feed to any form, with conditional logic if you want only certain submissions to sync.

Before you begin

You need three things: the ClickSyncr for MailerLite plugin activated, Fluent Forms active, and a MailerLite account (the free tier is fine, with permission to create an API token). Fluent Forms uses one global API key plus a feed per form, and the module must be enabled before anything appears.

Get your MailerLite API key

1. Log in to MailerLite and go to Integrations → API (dashboard.mailerlite.com/integrations/api).
2. Generate a new token and give it a recognisable name such as WordPress ClickSyncr.
3. Copy it immediately: MailerLite shows the full token only once. If you lose it, generate another.

Treat the token like a password. Anyone holding it can read and modify your MailerLite subscribers.

Fluent Forms setup, step by step

1. Enable the MailerLite (ClickSyncr) module first. Go to Fluent Forms → Integrations and switch the module to Enabled. Fluent Forms hides every integration until its module is on; if the MailerLite feed is missing from a form, this is almost always why.
   

   

2. Save your API key once, globally. Open Fluent Forms → Global Settings → MailerLite (ClickSyncr) Settings, paste the key and save. It is verified against MailerLite immediately and a green panel confirms it. Ninja Forms and Formidable reuse this same shared key.
   

   

3. Add a feed to your form. Edit a form, then Settings & Integrations → Configure Integrations → Add New Integration → MailerLite (ClickSyncr).
   

   

4. Configure the feed and save. Name the feed, pick the group, map fields. Email Address is required; the rest are optional. Add conditional logic if needed, tick Enable This Feed, and click Save Feed.
   

   

The nine MailerLite fields

Every builder maps the same nine standard MailerLite fields, and any custom fields in your account appear in the list automatically. Only Email is mandatory; an unmapped field is simply skipped and never overwrites existing subscriber data with a blank value. If MailerLite rejects one value’s type, that single field is dropped and the subscriber still syncs.

Verify the sync

Submit the form on the front end (not the admin preview) with a test address you can recognise, filling every mapped field. In MailerLite, open Subscribers and confirm the subscriber exists, sits in the group you selected, and carries the mapped values. That one minute catches almost every configuration mistake.

Troubleshooting

Can I sync only some Fluent Forms submissions?

Yes. Feeds support Fluent Forms conditional logic, so a submission syncs to MailerLite only when your conditions match. You can also pause a feed with its toggle without deleting the mapping.

Where does the API key live?

One global key under Global Settings, shared with Ninja Forms and Formidable if you use them too.

Other form builders

ClickSyncr for MailerLite also connects Contact Form 7 · WPForms · Gravity Forms · Ninja Forms · Formidable Forms · Forminator. Overview, features and pricing: MailerLite integration for WordPress. Browse all ClickSyncr integrations.

“MailerLite” is a trademark of its respective owner. ClickSyncr for MailerLite is an independent integration and is not affiliated with, endorsed by, or sponsored by MailerLite.

Frequently asked questions

Does unchecked consent send an Unconfirmed subscriber to MailerLite?

An unchecked configured consent field currently prevents the Fluent Forms submission from being sent to MailerLite. That differs from selecting Unconfirmed as the saved subscriber status when no consent field is used. Check both controls before testing: the consent answer takes priority. A recorded “Nothing was sent. Consent was not given.” result means there was no subscriber request for that submission.

What does the MailerLite rate-limiting error mean?

The message “MailerLite is rate limiting this account. Try again shortly.” means MailerLite refused the request because of its request limit. It is a delivery error, not evidence that the Fluent Forms field mapping is wrong. Avoid repeatedly submitting the form while investigating. Check the contact and the recorded result, allow the account limit to clear, and then run a controlled test.

Which types can a new MailerLite custom field use?

The plugin’s field-creation method accepts text, number, or date. A field also needs a nonempty name; choosing another type is rejected before the creation request is sent. Decide what the Fluent Forms answer represents before creating its destination field. A numeric answer belongs in a number field, while descriptive content needs text. After creating the field, check the mapping and submit a representative value.