I am struggling to find a way to extend http request headers in eBays TradingApi SDK (v1113). Specifically I am trying to implement the digital signature requirements mandated by the EU/UK. Where I need to add specific headers to some api calls.
From what I can see all the headers are set by internal classes ApiCall, eBayAPIInterfaceService2, maybe ApiContext. But I dont see any public properties on the call wrapper instance to extend or add headers. Adding headers seems like a pretty normal thing and I would expect there is a standardized way to do this but I have not found anything in the docs or exploring the code.
