Custom Header for external Data Sources GET Request

Hello Zammad-Community,

is there any possibility to customize the header of the GET request for an external data source?
We are using JTL WaWi as our ERP and I’m trying to figure out, how to access the JTL Rest API.

After I got the API working and did an app-registration for zammad, I can add the HTTP-Authtoken, but the API requires X-AppId and X-AppVersion in the HTTP header, otherwise it will give me error 401 - not authorized.

Any idea how I can implement the two X-headers for the GET requests?

• Used Zammad version: 6.2.0-1709819739.c4f4ca8b.bookworm
• Used Zammad installation type: package
• Operating system: Debian 12
• Browser + version: Google Chrome

Expected behavior:

• Output of all the reuqested database-field

Actual behavior:

• error 401, not authorized

ty in advance