Webhook Client ID not unique

Dear community,

I have a question about the Adobe Sign Webhooks. I am developing an application for a client, which is using multiple application in combination with Adobe Sign. For each application a different API application is created in Adobe Sign. 

Our Webhook is assigned to the Default group. There are other applications also assigned to this Default group.

Problem: All applications are calling my Webhook. My application is also receiving from other applications webhook requests and the Client ID in the requests (the HTTP_X_ADOBESIGN_CLIENTID in the header) is for all API applications the same.

How do I distinquish different application in my webhook request?