Facing issue in capturing post request

i am capturing post request from this website (Excise, Taxation and Narcotics Control Department) ‘‘if somebody want to test ,you can use ASZ-338 in registration detail area’’
on browser this works fine but when i test it in post man, it returns only 1 in response. i tried all the possible ways in postman but nothing work
if some body knows what i am missing kindly guide me i shall be very kind full to you