Add customer ID to billing details

Hi,

how can i add the customer id to the billing details ? Dont get i work by the customization and would be happy for some tips.

@offgrind

In Settings > Invoice Design navigate to client details, and you’ll be able to add the client id number from there.

Hi, I want to add it to invoice details. Not available there.

One option would be to create a custom design and replace the field stack with the individual fields you want shown.