Webhooks in Terminal49

Webhooks provide real-time notifications about changes to your shipments and containers, letting you build responsive applications that update as soon as new information becomes available.

How Webhooks Work

You register a webhook with a URL endpoint that can receive POST requests
An event occurs on Terminal49 (e.g., a vessel arrives or customs status changes)
Terminal49 sends a notification to your registered URL with details about the event
Your application processes the notification and takes appropriate action

Setting Up Webhooks

Step 1: Create a Webhook Endpoint

First, you need to create an endpoint on your server that can receive POST requests. Here’s an example using Node.js with Express:

Webhook Endpoint

const express = require('express');
const app = express();
app.use(express.json());

app.post('/terminal49-webhook', (req, res) => {
  // Extract the event data
  const webhookData = req.body;

  // Process the webhook (recommended to do this asynchronously)
  processWebhook(webhookData);

  // Always return a 200 status code quickly to acknowledge receipt
  res.status(200).send('Webhook received');
});

function processWebhook(webhookData) {
  // Extract the event type
  const event = webhookData.data.attributes.event;

  // Extract the reference object (what the event is about)
  const referenceType = webhookData.data.relationships.reference_object.data.type;
  const referenceId = webhookData.data.relationships.reference_object.data.id;

  console.log(`Processing ${event} for ${referenceType} ${referenceId}`);

  // Handle different event types
  switch (event) {
    case 'container.transport.vessel_arrived':
      handleVesselArrival(webhookData);
      break;
    case 'container.available_for_pickup':
      handleContainerAvailable(webhookData);
      break;
    case 'container.pickup_lfd.changed':
      handleLastFreeDayChanged(webhookData);
      break;
    // Add cases for other events you're interested in
    default:
      console.log(`Unhandled event type: ${event}`);
  }
}

app.listen(3000, () => {
  console.log('Webhook server running on port 3000');
});

Your webhook endpoint must be publicly accessible over the internet for Terminal49 to send notifications to it. During development, you can use tools like ngrok to create a temporary public URL.

Step 2: Register Your Webhook with Terminal49

Once your endpoint is ready, register it with Terminal49’s API:

async function registerWebhook() {
  try {
    const response = await fetch('https://api.terminal49.com/v2/webhooks', {
      method: 'POST',
      headers: {
        'Authorization': 'Token YOUR_API_KEY',
        'Content-Type': 'application/vnd.api+json'
      },
      body: JSON.stringify({
        data: {
          type: "webhook",
          attributes: {
            url: "https://your-domain.com/terminal49-webhook",
            event_types: [
              "container.transport.vessel_arrived",
              "container.transport.vessel_discharged",
              "container.available_for_pickup",
              "container.pickup_lfd.changed",
              "container.holds.changed",
              "tracking_request.succeeded",
              "tracking_request.failed"
            ]
          }
        }
      })
    });

    const result = await response.json();
    console.log('Webhook registered:', result);
    return result;

  } catch (error) {
    console.error('Error registering webhook:', error);
    throw error;
  }
}

cURL Example

curl -X POST \
  https://api.terminal49.com/v2/webhooks \
  -H 'Authorization: Token YOUR_API_KEY' \
  -H 'Content-Type: application/vnd.api+json' \
  -d '{
    "data": {
      "type": "webhook",
      "attributes": {
        "url": "https://your-domain.com/terminal49-webhook",
        "event_types": [
          "container.transport.vessel_arrived",
          "container.transport.vessel_discharged",
          "container.available_for_pickup",
          "container.pickup_lfd.changed",
          "container.holds.changed",
          "tracking_request.succeeded",
          "tracking_request.failed"
        ]
      }
    }
  }'

Step 3: Verify and Test Your Webhook

After registering, you can test your webhook using Terminal49’s test tracking numbers:

Test Webhook

async function testWebhook() {
  try {
    // Create a tracking request with a test number
    const response = await fetch('https://api.terminal49.com/v2/tracking_requests', {
      method: 'POST',
      headers: {
        'Authorization': 'Token YOUR_API_KEY',
        'Content-Type': 'application/vnd.api+json'
      },
      body: JSON.stringify({
        data: {
          type: "tracking_request",
          attributes: {
            tracking_number: "TEST-ARRIVAL-TODAY", // Test number
            reference_number: "TEST-ORDER-123"
          }
        }
      })
    });

    const result = await response.json();
    console.log('Test tracking request created:', result);

  } catch (error) {
    console.error('Error creating test tracking request:', error);
  }
}

Managing Webhooks

Listing Your Webhooks

You can retrieve a list of all registered webhooks:

List Webhooks

async function listWebhooks() {
  try {
    const response = await fetch('https://api.terminal49.com/v2/webhooks', {
      headers: {
        'Authorization': 'Token YOUR_API_KEY'
      }
    });

    const result = await response.json();
    console.log('Your webhooks:', result.data);
    return result.data;

  } catch (error) {
    console.error('Error listing webhooks:', error);
    throw error;
  }
}

Updating a Webhook

To update an existing webhook (e.g., to change the URL or event types):

Update Webhook

async function updateWebhook(webhookId) {
  try {
    const response = await fetch(`https://api.terminal49.com/v2/webhooks/${webhookId}`, {
      method: 'PATCH',
      headers: {
        'Authorization': 'Token YOUR_API_KEY',
        'Content-Type': 'application/vnd.api+json'
      },
      body: JSON.stringify({
        data: {
          id: webhookId,
          type: "webhook",
          attributes: {
            url: "https://your-updated-domain.com/webhook",
            event_types: [
              "container.transport.vessel_arrived",
              "container.available_for_pickup"
              // Updated list of events
            ]
          }
        }
      })
    });

    const result = await response.json();
    console.log('Webhook updated:', result);
    return result;

  } catch (error) {
    console.error('Error updating webhook:', error);
    throw error;
  }
}

Deleting a Webhook

If you no longer need a webhook, you can delete it:

Delete Webhook

async function deleteWebhook(webhookId) {
  try {
    const response = await fetch(`https://api.terminal49.com/v2/webhooks/${webhookId}`, {
      method: 'DELETE',
      headers: {
        'Authorization': 'Token YOUR_API_KEY'
      }
    });

    if (response.status === 204) {
      console.log('Webhook deleted successfully');
      return true;
    } else {
      console.error('Failed to delete webhook:', response.status);
      return false;
    }

  } catch (error) {
    console.error('Error deleting webhook:', error);
    throw error;
  }
}

Webhook Payload Structure

When an event occurs, Terminal49 sends a webhook notification with a JSON:API structured payload:

Example Payload

{
  "data": {
    "id": "123e4567-e89b-12d3-a456-426614174000",
    "type": "webhook_notification",
    "attributes": {
      "event": "container.transport.vessel_arrived",
      "created_at": "2023-05-15T14:23:12Z"
    },
    "relationships": {
      "reference_object": {
        "data": {
          "id": "789e4567-e89b-12d3-a456-426614174000",
          "type": "container"
        }
      }
    }
  },
  "included": [
    {
      "id": "789e4567-e89b-12d3-a456-426614174000",
      "type": "container",
      "attributes": {
        "number": "MSCU1234567",
        "seal_number": "SEAL123456",
        "created_at": "2023-05-10T10:23:12Z",
        "updated_at": "2023-05-15T14:23:12Z"
      },
      "relationships": {
        "shipment": {
          "data": {
            "id": "456e4567-e89b-12d3-a456-426614174000",
            "type": "shipment"
          }
        }
      }
    }
  ]
}

Webhook Event Types

Terminal49 supports multiple event types that you can subscribe to:

Container Events

container.created: A new container is tracked in the system
container.estimated_arrival_changed: The estimated arrival date has changed
container.transport.vessel_arrived: The vessel carrying the container has arrived at port
container.transport.vessel_discharged: The container has been unloaded from vessel
container.available_for_pickup: The container is available for pickup from terminal
container.pickup_lfd.changed: Last Free Day for pickup has changed
container.holds.changed: Customs or terminal holds have changed
container.picked_up: The container has been picked up from terminal
container.empty_returned: The empty container has been returned to terminal

Tracking Request Events

tracking_request.succeeded: A tracking request was successful
tracking_request.failed: A tracking request failed to find container information

Shipment Events

shipment.created: A new shipment is created in the system
shipment.updated: A shipment’s details have been updated

Best Practices

1. Respond Quickly

Your webhook endpoint should acknowledge receipt of a webhook by returning a 2xx HTTP status code (200, 201, 202, or 204) as quickly as possible. Process the webhook data asynchronously after acknowledging receipt.

2. Implement Idempotency

Design your webhook handler to be idempotent, meaning it handles duplicate webhook deliveries gracefully. Terminal49 may retry webhook delivery if your server doesn’t respond with a success code.

3. Secure Your Endpoint

Use HTTPS for your webhook endpoint
Consider implementing webhook signature validation if available
Only accept webhooks from Terminal49’s IP ranges if possible

4. Implement Error Handling

Handle errors gracefully and set up monitoring for your webhook endpoint. If webhooks aren’t being received as expected, check your server logs and Terminal49 dashboard.

5. Add Fallback Mechanisms

Implement a polling fallback that periodically checks the API directly in case webhooks are missed or delayed. This ensures your data stays up-to-date even if webhook delivery fails.

Troubleshooting

Missing Webhook Notifications

Check if your webhook URL is accessible from the internet
Verify your server is returning 2xx status codes
Check if the webhook is registered correctly
Look for any firewalls or security measures blocking incoming requests

Duplicate Notifications

Terminal49 may retry webhook delivery if your server doesn’t respond or returns an error. Implement idempotency in your handler to prevent processing the same event multiple times.

Webhook Testing

Use Terminal49’s test tracking numbers to simulate events and test your webhook handling without waiting for real events to occur.

Next Steps

Polling vs. Webhooks

Compare different approaches for receiving updates from Terminal49.

API Reference

View the complete webhook API reference.

Testing in Production

Learn about test tracking numbers to simulate events.

See the Data Model

Understand how webhooks relate to Terminal49’s data model.

Overview

Guides

Useful Info

Implementing Webhooks

Webhooks in Terminal49

How Webhooks Work

Setting Up Webhooks

Step 1: Create a Webhook Endpoint

Step 2: Register Your Webhook with Terminal49

Step 3: Verify and Test Your Webhook

Managing Webhooks

Listing Your Webhooks

Updating a Webhook

Deleting a Webhook

Webhook Payload Structure

Webhook Event Types

Best Practices

Troubleshooting

Next Steps

Polling vs. Webhooks

API Reference

Testing in Production

See the Data Model

Overview

Guides

Useful Info

​Webhooks in Terminal49

​How Webhooks Work

​Setting Up Webhooks

​Step 1: Create a Webhook Endpoint

​Step 2: Register Your Webhook with Terminal49

​Step 3: Verify and Test Your Webhook

​Managing Webhooks

​Listing Your Webhooks

​Updating a Webhook

​Deleting a Webhook

​Webhook Payload Structure

​Webhook Event Types

​Best Practices

​Troubleshooting

​Next Steps

Polling vs. Webhooks

API Reference

Testing in Production

See the Data Model

Webhooks in Terminal49

How Webhooks Work

Setting Up Webhooks

Step 1: Create a Webhook Endpoint

Step 2: Register Your Webhook with Terminal49

Step 3: Verify and Test Your Webhook

Managing Webhooks

Listing Your Webhooks

Updating a Webhook

Deleting a Webhook

Webhook Payload Structure

Webhook Event Types

Best Practices

Troubleshooting

Next Steps