@clearbluskyy and @Keith williams
Even if you refer the DGCA CPL or ATPL syllabus you wont find something called PAY LOAD
ATPL
http://www.dgca.nic.in/cars/d7b-b6.pdf
CPL
http://www.dgca.nic.in/cars/D7B-B4.pdf
PAY LOAD is very popularly used in India by the ground instructors to refer to MASS and BALANCE topics .
Before the DGCA implemented the JAA / EASA syllabus the only topic that used to appear for the CPL/ATPL exams from MASS and BALANCE was PAYLOAD or other wise known as TRAFFIC LOAD
Since the DGCA adopted the EASA syllabus it was changed to TRAFFIC LOAD and they started including the other topic in MASS and BALANCE as well .