How to pass system meta values in a web hook?

1. Create system Meta key and values

• Login -> Systems Menu -> Click "Configs Icon" of your system -> Select Meta Tab.  
• Click Add Meta Button
• Add your custom key, values and Save it.  The below one is the sample screen with meta key and values.

2. Add/Edit your webhook from the Webhooks menu.

3. Add your system meta values in customer header or custom payload.

4. For example, if you want this system meta values in the custom payload.  Enable custom payload and enter your key and value should be in the format of ${system.meta.meta_key}

5. Next measurement trigger, the new configured key and system meta value received via your webhook endpoint.