MailerLite API

openapi: 3.1.0
info:
  title: MailerLite API
  description: >-
    The MailerLite REST API provides endpoints for managing subscribers,
    groups, segments, fields, campaigns, automations, forms, and webhooks.
    Authentication uses a Bearer token generated in the dashboard under
    Integrations > MailerLite API. All requests use JSON; rate-limited to
    120 requests per minute per account.
  version: "1.0.0"
  contact:
    name: MailerLite
    url: https://developers.mailerlite.com/docs/
servers:
  - url: https://connect.mailerlite.com
    description: Production
security:
  - BearerAuth: []
tags:
  - name: Subscribers
  - name: Groups
  - name: Segments
  - name: Fields
  - name: Campaigns
  - name: Automations
  - name: Forms
  - name: Webhooks
paths:
  /api/subscribers:
    get:
      tags: [Subscribers]
      summary: List subscribers
      operationId: listSubscribers
      parameters:
        - name: limit
          in: query
          schema:
            type: integer
        - name: cursor
          in: query
          schema:
            type: string
        - name: filter[status]
          in: query
          schema:
            type: string
            enum: [active, unsubscribed, unconfirmed, bounced, junk]
      responses:
        '200':
          description: Subscribers
    post:
      tags: [Subscribers]
      summary: Create or update a subscriber
      operationId: upsertSubscriber
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required: [email]
              properties:
                email:
                  type: string
                  format: email
                fields:
                  type: object
                groups:
                  type: array
                  items:
                    type: string
                status:
                  type: string
      responses:
        '200':
          description: Subscriber
  /api/subscribers/{subscriber}:
    get:
      tags: [Subscribers]
      summary: Get subscriber by ID or email
      operationId: getSubscriber
      parameters:
        - name: subscriber
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Subscriber
    put:
      tags: [Subscribers]
      summary: Update an existing subscriber
      operationId: updateSubscriber
      parameters:
        - name: subscriber
          in: path
          required: true
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
      responses:
        '200':
          description: Updated
    delete:
      tags: [Subscribers]
      summary: Delete subscriber
      operationId: deleteSubscriber
      parameters:
        - name: subscriber
          in: path
          required: true
          schema:
            type: string
      responses:
        '204':
          description: Deleted
  /api/subscribers/{id}/forget:
    post:
      tags: [Subscribers]
      summary: Forget subscriber (GDPR delete)
      operationId: forgetSubscriber
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Forget request accepted
  /api/subscribers/{id}/activity-log:
    get:
      tags: [Subscribers]
      summary: Get subscriber activity log
      operationId: getSubscriberActivity
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Activity events
  /api/groups:
    get:
      tags: [Groups]
      summary: List groups
      operationId: listGroups
      responses:
        '200':
          description: Groups
    post:
      tags: [Groups]
      summary: Create a group
      operationId: createGroup
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required: [name]
              properties:
                name:
                  type: string
      responses:
        '201':
          description: Group
  /api/groups/{group_id}:
    delete:
      tags: [Groups]
      summary: Delete a group
      operationId: deleteGroup
      parameters:
        - name: group_id
          in: path
          required: true
          schema:
            type: string
      responses:
        '204':
          description: Deleted
  /api/segments:
    get:
      tags: [Segments]
      summary: List segments
      operationId: listSegments
      responses:
        '200':
          description: Segments
  /api/fields:
    get:
      tags: [Fields]
      summary: List custom fields
      operationId: listFields
      responses:
        '200':
          description: Fields
    post:
      tags: [Fields]
      summary: Create a custom field
      operationId: createField
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required: [name, type]
              properties:
                name:
                  type: string
                type:
                  type: string
                  enum: [text, number, date]
      responses:
        '201':
          description: Field
  /api/campaigns:
    get:
      tags: [Campaigns]
      summary: List campaigns
      operationId: listCampaigns
      responses:
        '200':
          description: Campaigns
    post:
      tags: [Campaigns]
      summary: Create a campaign
      operationId: createCampaign
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
      responses:
        '201':
          description: Campaign
  /api/campaigns/{campaign_id}:
    get:
      tags: [Campaigns]
      summary: Get a campaign
      operationId: getCampaign
      parameters:
        - name: campaign_id
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Campaign
  /api/automations:
    get:
      tags: [Automations]
      summary: List automations
      operationId: listAutomations
      responses:
        '200':
          description: Automations
  /api/forms/{type}:
    get:
      tags: [Forms]
      summary: List forms by type (popup, embedded, promotion)
      operationId: listForms
      parameters:
        - name: type
          in: path
          required: true
          schema:
            type: string
            enum: [popup, embedded, promotion]
      responses:
        '200':
          description: Forms
  /api/webhooks:
    get:
      tags: [Webhooks]
      summary: List webhooks
      operationId: listWebhooks
      responses:
        '200':
          description: Webhooks
    post:
      tags: [Webhooks]
      summary: Create a webhook
      operationId: createWebhook
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required: [url, events]
              properties:
                url:
                  type: string
                  format: uri
                events:
                  type: array
                  items:
                    type: string
                name:
                  type: string
      responses:
        '201':
          description: Webhook
  /api/webhooks/{webhook_id}:
    delete:
      tags: [Webhooks]
      summary: Delete a webhook
      operationId: deleteWebhook
      parameters:
        - name: webhook_id
          in: path
          required: true
          schema:
            type: string
      responses:
        '204':
          description: Deleted
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: Bearer token generated under Integrations > MailerLite API in the dashboard.