Webhooks

Webhooks are a powerful mechanism for creating real-time, event-driven integrations between FileMaker and other systems.

What are Webhooks?

Webhooks are HTTP callbacks that occur when something happens - they're "user-defined HTTP callbacks" triggered by specific events. Unlike traditional APIs where you need to poll for data, webhooks push data to your application when events occur.

Think of webhooks as a "phone number" that other services can call when something interesting happens.

How Webhooks Work

1. Registration: Your application registers a URL endpoint with a service
2. Event Occurs: When a specific event happens in that service
3. Notification: The service sends an HTTP request (usually POST) to your registered URL
4. Processing: Your endpoint receives and processes the data

FileMaker as a Webhook Consumer

FileMaker can receive webhook data through:

Web Publishing Engine

Using the FileMaker Web Publishing Engine, you can create custom endpoints that receive webhook data:

1. Create a web-accessible FileMaker file
2. Set up proper authentication
3. Create a layout and script to process incoming webhook data
4. Configure the service to send webhooks to your FileMaker Server URL

FileMaker Server API

The Data API can be used to receive webhook data by:

1. Creating an endpoint script
2. Using the /FileMaker/Data/v1/script/{database}/{script} endpoint
3. Processing the webhook payload in your script

FileMaker as a Webhook Provider

FileMaker can also trigger webhooks to other systems using:

Insert From URL [Select; $result; "https://webhook.site/your-endpoint";
  cURL options: "-X POST -H \"Content-Type: application/json\" --data \"{\"event\":\"record_created\",\"id\":\"" & $recordID & "\"}\""
]

Common Webhook Implementations

Integration Platforms

• Zapier: Offers FileMaker integrations via webhooks
• Make (Integromat): Can connect to FileMaker through webhooks
• Pipedream: Supports webhook-triggered workflows

SaaS Applications

• Stripe: Payment processing events
• GitHub: Repository events
• Slack: Interactive message events

Security Considerations

When implementing webhooks:

1. Validate Sources: Verify the webhook is coming from an expected source
2. Use HTTPS: Always use encrypted connections
3. Implement Secrets: Use shared secrets or signatures to validate requests
4. Rate Limiting: Protect against DoS attacks by implementing rate limits

Authentication Methods

Common webhook authentication approaches:

• API Keys: Include in headers or URL parameters
• HMAC Signatures: Verify the sender by checking message signatures
• OAuth Tokens: For more complex authentication requirements
• IP Whitelisting: Restrict webhook sources to known IP addresses

Best Practices

1. Idempotency: Handle duplicate webhook deliveries gracefully
2. Response Codes: Return appropriate HTTP status codes promptly
3. Async Processing: Acknowledge receipt quickly, process in background
4. Logging: Maintain detailed logs of webhook activity
5. Error Handling: Implement robust error handling with retries

When to Use Webhooks

Webhooks are ideal when:

• You need real-time updates
• You want to reduce polling overhead
• You need event-driven workflows
• You're integrating with services that support webhooks