openapi: 3.2.0
info:
  title: Plunk Templates API
  description: Open-source email platform API for transactional emails, campaigns, and marketing automation
  version: 1.0.0
  contact:
    name: Plunk Support
    url: https://www.useplunk.com
servers:
- url: https://next-api.useplunk.com
  description: Production server
security:
- ApiKeyAuth: []
tags:
- name: Templates
  description: Email template management
paths:
  /templates:
    get:
      tags:
      - Templates
      summary: List templates
      description: 'Get a paginated list of email templates.


        This endpoint uses **offset pagination** (`page` / `pageSize`), not the cursor pagination used by `GET /contacts`.'
      operationId: listTemplates
      parameters:
      - $ref: '#/components/parameters/Page'
      - $ref: '#/components/parameters/PageSize'
      - name: type
        in: query
        schema:
          type: string
          enum:
          - TRANSACTIONAL
          - MARKETING
          - HEADLESS
        description: Filter by template type.
      - name: search
        in: query
        schema:
          type: string
        description: Case-insensitive match on name, description, or subject.
      - name: sort
        in: query
        schema:
          type: string
          enum:
          - name
          - createdAt
          - updatedAt
          default: createdAt
        description: Column to sort by. Unrecognised values fall back to `createdAt`.
      - $ref: '#/components/parameters/SortDirection'
      responses:
        '200':
          description: List of templates
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Template'
                  total:
                    type: integer
                    description: Total templates matching the filters, across all pages.
                  page:
                    type: integer
                  pageSize:
                    type: integer
                  totalPages:
                    type: integer
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      tags:
      - Templates
      summary: Create template
      description: 'Create a new email template.


        `from` is required and its domain must already be verified for this project, otherwise the request is rejected.'
      operationId: createTemplate
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - name
              - subject
              - body
              - from
              properties:
                name:
                  type: string
                  description: Internal name for the template.
                description:
                  type: string
                  description: Optional internal note. Not sent to recipients.
                subject:
                  type: string
                body:
                  type: string
                  description: HTML body. Use `{{variable}}` placeholders to interpolate contact data at send time.
                from:
                  type: string
                  format: email
                  description: Sender address. Must belong to a domain verified for this project.
                fromName:
                  type: string
                  description: Sender display name.
                replyTo:
                  type: string
                  format: email
                type:
                  type: string
                  enum:
                  - TRANSACTIONAL
                  - MARKETING
                  - HEADLESS
                  default: MARKETING
                  description: Optional. Defaults to `MARKETING` when omitted.
            example:
              name: Password reset
              subject: Reset your password
              body: '<h1>Hi {{firstName}}</h1><p>Use this code: {{resetCode}}</p>'
              from: hello@example.com
              fromName: My App
              type: TRANSACTIONAL
      responses:
        '201':
          description: Template created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Template'
        '400':
          description: A required field (`name`, `subject`, `body`, `from`) is missing.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LegacyError'
              example:
                error: From address is required
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/UnverifiedDomain'
components:
  responses:
    UnverifiedDomain:
      description: The sender domain is not registered to this project, or has not completed DNS verification. Add and verify the domain in your project settings first.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            success: false
            error:
              code: INTERNAL_SERVER_ERROR
              message: Domain "example.com" is not verified. Please complete the DNS verification process in your domain settings.
              statusCode: 403
              requestId: 8f14e45f-ceea-467a-9575-1f0f38e0b1c2
            timestamp: '2025-01-15T10:30:00.000Z'
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            success: false
            error:
              code: INVALID_API_KEY
              message: Invalid secret API key. This endpoint requires a secret key (sk_*), not a public key.
              statusCode: 401
              requestId: 8f14e45f-ceea-467a-9575-1f0f38e0b1c2
            timestamp: '2025-01-15T10:30:00.000Z'
  schemas:
    Template:
      type: object
      properties:
        id:
          type: string
        name:
          type: string
        description:
          type: string
          nullable: true
        subject:
          type: string
        body:
          type: string
          description: HTML content with `{{variable}}` placeholders.
        from:
          type: string
          format: email
          description: Sender address. Must belong to a verified domain.
        fromName:
          type: string
          nullable: true
        replyTo:
          type: string
          format: email
          nullable: true
        type:
          type: string
          enum:
          - TRANSACTIONAL
          - MARKETING
          - HEADLESS
        projectId:
          type: string
        createdAt:
          type: string
          format: date-time
        updatedAt:
          type: string
          format: date-time
    FieldError:
      type: object
      properties:
        field:
          type: string
          description: Dot-path of the offending field, e.g. `attachments.0.filename`.
        message:
          type: string
        code:
          type: string
          description: Validation issue code, e.g. `invalid_type`, `too_big`, `reserved_event`.
        received:
          description: The value that was received, when available.
    LegacyError:
      type: object
      description: Flat error shape returned by the hand-validated create/update endpoints (`POST /contacts`, `POST /templates`, `POST /segments`) for missing required fields. Unlike the rest of the API these return `400` with a bare `error` string rather than the standard envelope. Errors raised deeper in those same endpoints (404, 409, domain verification) still use the standard `Error` envelope.
      properties:
        error:
          type: string
    Error:
      type: object
      properties:
        success:
          type: boolean
          enum:
          - false
        error:
          type: object
          properties:
            code:
              type: string
              description: Machine-readable error code, e.g. `VALIDATION_ERROR`, `INVALID_API_KEY`, `IDEMPOTENCY_KEY_REUSED`.
            message:
              type: string
            statusCode:
              type: integer
            requestId:
              type: string
              description: Correlation ID for this request. Include it when contacting support.
            errors:
              type: array
              items:
                $ref: '#/components/schemas/FieldError'
              description: Field-level detail, present on validation failures.
            details:
              type: object
              additionalProperties: true
              description: Additional error context.
            suggestion:
              type: string
              description: Hint for fixing the request.
        timestamp:
          type: string
          format: date-time
  parameters:
    Page:
      name: page
      in: query
      schema:
        type: integer
        minimum: 1
        default: 1
      description: 1-based page number.
    PageSize:
      name: pageSize
      in: query
      schema:
        type: integer
        minimum: 1
        default: 20
      description: Items per page.
    SortDirection:
      name: dir
      in: query
      schema:
        type: string
        enum:
        - asc
        - desc
        default: desc
      description: Sort direction. Unrecognised values fall back to the default.
  securitySchemes:
    ApiKeyAuth:
      type: http
      scheme: bearer
      bearerFormat: API Key
      description: 'API Key authentication. The project is automatically derived from the key.


        **`/v1/track` requires a public key (`pk_*`)** — it is the one endpoint intended for client-side use, and a secret key is rejected there with `401`.


        **Every other endpoint requires a secret key (`sk_*`)** and rejects public keys with `401`.


        So the two key types are not interchangeable in either direction: pick the key that matches the endpoint you are calling.'
x-ext-urls: {}