In order to perform operations such as GetKeywordsByAdGroupId I have to set the CustomerId field in the request header.
This can be found in the UI but we manage several customers and need to get this CustomerID programmatically, to then use it in other requests.
I tried the GetCustomersInfo Service Operation, but the returned ID is not the CustomerID. It's some other system ID (3 digits in this test case).
How can I find the CustomerID field programmatically? I believe this is called a Manager account Number in the UI.