Implicit enhancement would be by default available at predefined places (Begin of method, end of method, etc.)
You can create the Explicit Enhancements which would be there in your program as
ENHANCEMENT-POINT: ZTEST_NP_EP_01 SPOTS ZTEST_NP_EP.
To create this, use the menu option Edit > Enhancement Operations > Create Option. In the popup, provide the details.
You can also provide the new BADI definitions which customer can implement.
P.S. = Transfer me the share for this design from your Product revenue 
Regards,
Naimesh Patel