Connect Formidable Forms to MailerLite
Connect Formidable Forms to MailerLite with a form action, in Formidable Lite as well as Pro. The free ClickSyncr for MailerLite plugin adds a MailerLite (ClickSyncr) action under Actions & Notifications: pick a group, set the email field, map the rest, update.
Before you begin
You need three things: the ClickSyncr for MailerLite plugin activated, Formidable Forms active, and a MailerLite account (the free tier is fine, with permission to create an API token). Formidable uses a key per action, or reuses the shared global key when you leave its key box empty. Works in Formidable Lite.
Get your MailerLite API key
- Log in to MailerLite and go to Integrations → API (dashboard.mailerlite.com/integrations/api).
- Generate a new token and give it a recognisable name such as
WordPress ClickSyncr. - 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.
Formidable Forms setup, step by step
- Open Actions & Notifications for your form. Go to Formidable → Forms, open a form, then Settings → Actions & Notifications.
- Add the MailerLite (ClickSyncr) action. Additionally, click MailerLite (ClickSyncr) in the row of available actions. It is available in Formidable Lite; no Pro licence needed.
Adding the MailerLite action from the Actions and Notifications picker. - Fill in the action and update. Moreover, leave the API key box blank to reuse the shared key saved in Fluent Forms or Ninja Forms, or paste a different key to use a separate MailerLite account for this action. Pick the group, set Email Address (required), map the rest, and click Update.
A configured MailerLite action: shared key, group, required email, and all field mappings.
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.
| Field | MailerLite key | Notes |
|---|---|---|
email |
Required. The subscriber identifier. | |
| Name | name |
First name. |
| Last name | last_name |
|
| Phone | phone |
|
| Company | company |
|
| City | city |
|
| Country | country |
|
| State | state |
|
| Zip | z_i_p |
MailerLite’s key really is z_i_p. |
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
| Symptom | Cause and fix |
|---|---|
| The group dropdown is empty | The key is missing, mistyped, or was revoked in MailerLite. Re-paste it and reconnect. A key with a trailing space is the classic culprit. |
| Submissions do not appear in MailerLite | Nine times out of ten the Email field is not mapped. It is the one required mapping. Fix it, then submit a fresh test. |
| The action shows no groups | Its key box is empty and no shared key exists yet. Paste a key into the action, or save one in Fluent Forms or Ninja Forms settings first. |
| The subscriber syncs but a field is empty | Either that field is unmapped, or it was blank on the submission. Empty values are skipped so they never wipe existing MailerLite data. |
| One field never arrives, the rest do | MailerLite rejected that value’s type, for example letters in a number field. The plugin drops just the offending field and syncs the rest. |
Does this work in Formidable Lite?
Yes. The MailerLite action is registered for Formidable Lite as well as Pro.
Can one site use two MailerLite accounts?
Yes. Each Formidable action can carry its own API key, so different forms can feed different accounts.
Other form builders
ClickSyncr for MailerLite also connects Contact Form 7 · WPForms · Gravity Forms · Ninja Forms · Fluent 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.