Iap-galaxyapps.h not found

Galaxy Watch for Tizen Tizen Native APIs
1

I try to implement in app purchase in my watch by following this guide.
I already install Tizen extension SDK from package manager, but when I add this code

#include <iap-galaxyapps.h>

I got error iap-galaxyapps.h not found from tizen studio.
Any idea what’s going on ?

2

It turns out the extension sdk must be activated in the project manually.
Go to properties -> c/c++ build -> tizen settings -> framework and check samsung-extension