Parcels App Webhooks API

openapi: 3.0.3
info:
  title: Parcels Account Webhooks API
  version: 1.0.0
  description: 'Track packages and shipments worldwide through the Parcels API. Tracking is asynchronous: create a tracking request, then poll by UUID until the result is complete. Use the Mock API server in this documentation to try the flow without an API key or account limits.'
  contact:
    name: Parcels
    url: https://parcelsapp.com
    email: hello@parcelsapp.com
servers:
- url: https://parcelsapp.com/api/v3
  description: Live API
tags:
- name: Webhooks
  description: Callbacks sent to your `webhookUrl` when tracking progresses or completes. Pass `webhookUrl` in `POST /shipments/tracking`; Parcels sends JSON `POST` requests to that URL.
paths:
  /parcels-webhook:
    post:
      operationId: receiveTrackingWebhook
      summary: Receive tracking webhook
      description: 'This is the endpoint that you host, not a Parcels API endpoint. Provide its URL as `webhookUrl` when creating a tracking request.


        Parcels sends `POST` requests with `Content-Type: application/json`. Return any 2xx response quickly after accepting the payload. Network errors, timeouts, and HTTP 4xx/5xx responses are treated as failed deliveries and may be retried.


        Typical flow: create tracking with `webhookUrl`, save the returned `uuid`, then match incoming webhook events by `uuid`. For batches, expect zero or more `shipment_completed` events followed by one `batch_completed` event when all non-cached shipments finish. If the create response included cached shipments, keep those from the create response; webhook payloads cover the newly tracked remainder.'
      tags:
      - Webhooks
      servers:
      - url: https://example.com
        description: Your application server
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/WebhookPayload'
            examples:
              shipmentCompleted:
                summary: Single shipment completed
                value:
                  event: shipment_completed
                  uuid: demo_mixed_cache
                  timestamp: '2026-07-07T06:45:00.000Z'
                  done: false
                  shipment:
                    trackingId: '9400111206213785678901'
                    status: delivered
                    origin: United States
                    destination: United States
                    originCode: US
                    destinationCode: US
                    states:
                    - state: Delivered, In/At Mailbox
                      location: Austin, TX, United States
                      date: '2026-06-25T18:42:00.000Z'
                      carrier: 0
                    - state: Arrived at Post Office
                      location: Austin, TX, United States
                      date: '2026-06-25T13:17:00.000Z'
                      carrier: 0
                    services:
                    - slug: usps
                      name: USPS
                    detectedCarrier:
                      slug: usps
                      name: USPS
              batchCompleted:
                summary: Batch completed
                value:
                  event: batch_completed
                  uuid: demo_mixed_cache
                  timestamp: '2026-07-07T06:46:10.000Z'
                  done: true
                  shipments:
                  - trackingId: '9400111206213785678901'
                    status: delivered
                    origin: United States
                    destination: United States
                    originCode: US
                    destinationCode: US
                    states:
                    - state: Delivered, In/At Mailbox
                      location: Austin, TX, United States
                      date: '2026-06-25T18:42:00.000Z'
                      carrier: 0
                    - state: Arrived at Post Office
                      location: Austin, TX, United States
                      date: '2026-06-25T13:17:00.000Z'
                      carrier: 0
                    services:
                    - slug: usps
                      name: USPS
                    detectedCarrier:
                      slug: usps
                      name: USPS
              trackingError:
                summary: Tracking workflow error
                value:
                  event: tracking_error
                  uuid: demo_mixed_cache
                  timestamp: '2026-07-07T06:46:10.000Z'
                  done: true
                  error: TRACKING_ERROR
                  message: Failed to save tracking result for 9400111206213785678901
      responses:
        '200':
          description: Return any 2xx status after accepting the webhook payload. The response body is ignored.
      x-codeSamples:
      - lang: JavaScript
        label: Express
        source: "app.post('/parcels-webhook', express.json(), (req, res) => {\n  const event = req.body;\n\n  if (event.event === 'shipment_completed') {\n    console.log('Shipment finished', event.uuid, event.shipment.trackingId);\n  }\n\n  if (event.event === 'batch_completed') {\n    console.log('Batch finished', event.uuid, event.shipments.length);\n  }\n\n  res.sendStatus(204);\n});"
      - lang: Python
        label: Flask
        source: "from flask import Flask, request\n\napp = Flask(__name__)\n\n@app.post('/parcels-webhook')\ndef parcels_webhook():\n    event = request.get_json()\n    if event['event'] == 'shipment_completed':\n        print('Shipment finished', event['uuid'], event['shipment']['trackingId'])\n    if event['event'] == 'batch_completed':\n        print('Batch finished', event['uuid'], len(event.get('shipments', [])))\n    return ('', 204)"
      - lang: PHP
        label: PHP
        source: "<?php\n$event = json_decode(file_get_contents('php://input'), true);\n\nif ($event['event'] === 'shipment_completed') {\n  error_log('Shipment finished ' . $event['uuid'] . ' ' . $event['shipment']['trackingId']);\n}\n\nif ($event['event'] === 'batch_completed') {\n  error_log('Batch finished ' . $event['uuid'] . ' ' . count($event['shipments'] ?? []));\n}\n\nhttp_response_code(204);\n?>"
components:
  schemas:
    Attribute:
      type: object
      properties:
        l:
          type: string
          description: Attribute label.
          example: origin
        n:
          type: string
          description: Optional display name.
          example: Weight
        val:
          type: string
          description: Attribute value.
          example: United States
        code:
          type: string
          description: Optional code value.
          example: US
    Carrier:
      type: object
      properties:
        slug:
          type: string
          description: Carrier identifier.
          example: usps
        name:
          type: string
          description: Carrier display name.
          example: USPS
    Shipment:
      type: object
      properties:
        trackingId:
          type: string
          description: Tracking number.
          example: '9400111206213785678901'
        status:
          type: string
          description: Current normalized shipment status.
          enum:
          - transit
          - arrived
          - pickup
          - delivered
          - returned
          - archive
          example: delivered
        origin:
          type: string
          description: Localized origin country.
          example: United States
        destination:
          type: string
          description: Localized destination country.
          example: United States
        originCode:
          type: string
          description: Two-letter origin country code.
          example: US
        destinationCode:
          type: string
          description: Two-letter destination country code.
          example: US
        states:
          type: array
          description: Tracking events in reverse chronological order.
          items:
            $ref: '#/components/schemas/Event'
        services:
          type: array
          description: Carriers queried for this tracking number.
          items:
            $ref: '#/components/schemas/Carrier'
        detectedCarrier:
          $ref: '#/components/schemas/Carrier'
        detected:
          type: array
          description: Indexes into `services` where tracking events were found.
          items:
            type: integer
        attributes:
          type: array
          description: Additional carrier metadata such as origin, destination, weight, or references.
          items:
            $ref: '#/components/schemas/Attribute'
        externalTracking:
          type: array
          description: Direct carrier tracking links.
          items:
            $ref: '#/components/schemas/OutgoingLink'
    OutgoingLink:
      type: object
      properties:
        slug:
          type: string
          example: usps
        url:
          type: string
          format: uri
          example: https://tools.usps.com/go/TrackConfirmAction?tLabels=9400111206213785678901
        trackingId:
          type: string
          example: '9400111206213785678901'
        method:
          type: string
          enum:
          - GET
          - POST
          example: GET
    Event:
      type: object
      properties:
        state:
          type: string
          description: Human-readable tracking event text.
          example: Delivered, In/At Mailbox
        location:
          type: string
          description: Event location.
          example: Austin, TX, United States
        date:
          type: string
          format: date-time
          description: UTC event timestamp.
          example: '2026-06-25T18:42:00.000Z'
        carrier:
          type: integer
          description: Index of the reporting carrier in the `services` array.
          example: 0
    WebhookPayload:
      type: object
      description: JSON body Parcels sends to the `webhookUrl` from `POST /shipments/tracking`. A `shipment_completed` event contains `shipment`; a `batch_completed` event contains `shipments`; a `tracking_error` event contains `error` and `message`.
      properties:
        event:
          type: string
          enum:
          - shipment_completed
          - batch_completed
          - tracking_error
          example: batch_completed
          description: Webhook event type. `shipment_completed` means one newly tracked shipment finished. `batch_completed` means all newly tracked, non-cached shipments for the UUID finished.
        uuid:
          type: string
          example: demo_usps_delivered
          description: Tracking request UUID returned by `POST /shipments/tracking`.
        timestamp:
          type: string
          format: date-time
          example: '2026-06-25T18:43:00.000Z'
        done:
          type: boolean
          example: true
          description: '`true` when the whole tracking request is complete. Individual shipment events usually have `done: false`; the final batch event has `done: true`.'
        shipment:
          allOf:
          - $ref: '#/components/schemas/Shipment'
          description: 'Present on `shipment_completed`: the finished newly tracked shipment result.'
        shipments:
          type: array
          items:
            $ref: '#/components/schemas/Shipment'
          description: 'Present on `batch_completed`: finished results for the newly tracked, non-cached shipments in this UUID. Cached shipments, if any, were already returned in the create response.'
        error:
          type: string
          example: TRACKING_ERROR
          description: 'Present on `tracking_error`: stable error type.'
        message:
          type: string
          example: Failed to save tracking result
          description: 'Present on `tracking_error`: human-readable error details.'
x-tagGroups:
- name: Guide
  tags:
  - Account
  - Tracking
  - Webhooks