Here at Splash, we understand how important it is to keep your events GDPR compliant. If you are tracking unsubscribes in a third party system, you can use our Incoming Webhook integration to collect that data, so that Splash knows who should not receive outbound communications. 

1. Click on New Integration and choose Incoming Webhook
   
   
2. Select a - Webhook Action (i.e Unsubscribe) and follow the Instructions

From there, you can input your data: 

1. Post to the URI listed above
2. Note that "emails" field is required. Multiple email addresses should be separated by commas.
3. Use Content-Type: application/json 
4. If event_id is provided then the guest will be unsubscribed from only that event
5. If event_id is NOT provided then the contact will be unsubscribed from splash

Finally, set up your system on fire (POST to Splash Webhook URL) each time an unsubscribe takes place. Be sure to use the correct header value: 

NOTE: You can follow the same steps to add separate Incoming Webhooks for (Resubscribe and Anonymize)

You can use any tool to make these POST API calls to Splash (Postman is a popular tool to make API calls)