Stannp Postcards API

openapi: 3.0.3
info:
  title: Stannp Direct Mail Account Postcards API
  description: 'REST API for programmatically sending physical letters and postcards, managing recipient groups, configuring campaigns, triggering individual mail pieces, and tracking delivery status through webhooks and event callbacks. Authentication uses API key-based HTTP Basic Auth over HTTPS.

    '
  version: 1.0.0
  contact:
    name: Stannp Support
    url: https://www.stannp.com/us/direct-mail-api/guide
  termsOfService: https://www.stannp.com
servers:
- url: https://api-us1.stannp.com/v1
  description: US API server
- url: https://api-eu1.stannp.com/v1
  description: EU API server
security:
- basicAuth: []
tags:
- name: Postcards
  description: Create, retrieve, and cancel postcard mailpieces
paths:
  /postcards/create:
    post:
      operationId: createPostcard
      summary: Create a postcard
      description: 'Create and dispatch a single postcard. Use test=true to generate a preview PDF without charges.

        '
      tags:
      - Postcards
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                size:
                  type: string
                  enum:
                  - 4x6
                  - 6x9
                  - 6x11
                  default: 4x6
                  description: Postcard size (US formats)
                test:
                  type: boolean
                  description: Produce sample PDF without dispatch or charges
                template:
                  type: integer
                  description: Template ID from the platform
                recipient:
                  description: Existing recipient ID or new recipient object
                  oneOf:
                  - type: integer
                    description: Existing recipient ID
                  - $ref: '#/components/schemas/RecipientInput'
                message:
                  type: string
                  description: Text overlay on postcard back
                front:
                  type: string
                  format: uri
                  description: URL to JPG, PNG, or PDF for the front design
                back:
                  type: string
                  format: uri
                  description: URL to JPG, PNG, or PDF for the back design
                padding:
                  type: integer
                  description: White border control; 0 removes the default border
                post_unverified:
                  type: boolean
                  default: true
                  description: Prevents posting if address is unverified
                clearzone:
                  type: boolean
                  description: Overlays clear zones with white background
                return_address:
                  type: string
                  description: Custom return address
                tags:
                  type: string
                  description: Comma-separated searchable tags
                addons:
                  type: string
                  description: Upgrade codes (e.g. FIRST_CLASS)
                idempotency_key:
                  type: string
                  description: Key for safe request retries
      responses:
        '200':
          description: Postcard created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailpieceResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /postcards/get/{id}:
    get:
      operationId: getPostcard
      summary: Get a postcard
      description: Retrieve details of a single postcard mailpiece.
      tags:
      - Postcards
      parameters:
      - name: id
        in: path
        required: true
        schema:
          type: integer
        description: Mailpiece ID
      responses:
        '200':
          description: Postcard details retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailpieceResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /postcards/cancel:
    post:
      operationId: cancelPostcard
      summary: Cancel a postcard
      description: Cancel a postcard that has not yet been dispatched.
      tags:
      - Postcards
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              required:
              - id
              properties:
                id:
                  type: integer
                  description: Mailpiece ID to cancel
      responses:
        '200':
          description: Postcard cancelled successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SuccessResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    RecipientInput:
      type: object
      properties:
        group_id:
          type: integer
          description: Group to add the recipient to
        title:
          type: string
          description: Title (Mr, Mrs, Dr, etc.)
        firstname:
          type: string
        lastname:
          type: string
        company:
          type: string
        job_title:
          type: string
        address1:
          type: string
          description: First line of address
        address2:
          type: string
        address3:
          type: string
        city:
          type: string
        county:
          type: string
          description: State or county
        postcode:
          type: string
          description: Postcode or ZIP code
        zipcode:
          type: string
          description: ZIP code (US alternative to postcode)
        country:
          type: string
          description: ISO 3166-1 Alpha-2 country code
          example: US
        email:
          type: string
          format: email
        phone_number:
          type: string
        ref_id:
          type: string
          description: Custom external reference ID
        on_duplicate:
          type: string
          enum:
          - update
          - ignore
          - duplicate
          description: Behaviour when duplicate is found
        test_level:
          type: string
          enum:
          - email
          - fullname
          - initial
          - ref_id
          description: Field(s) used to detect duplicates
    SuccessResponse:
      type: object
      properties:
        success:
          type: boolean
        data:
          description: Result value (boolean, integer, or string depending on operation)
    MailpieceResponse:
      type: object
      properties:
        success:
          type: boolean
        data:
          type: object
          properties:
            id:
              type: integer
              description: Mailpiece ID
            pdf:
              type: string
              format: uri
              description: URL to the proof PDF
            created:
              type: string
              format: date-time
            format:
              type: string
              description: Mail piece format/size
            cost:
              type: string
              description: Cost of the mailpiece
            status:
              type: string
              description: Current status
            tracking_reference:
              type: string
              description: Carrier tracking reference
            dispatched:
              type: string
              format: date-time
              description: Dispatch timestamp
    ErrorResponse:
      type: object
      properties:
        success:
          type: boolean
          example: false
        error:
          type: string
          description: Error message
  responses:
    NotFound:
      description: Resource not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    Unauthorized:
      description: Authentication required or API key invalid
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: Use your API key as the username and leave the password blank.