There is nothing official in place for referrals. However, if you want something....just tell your PVP that if you refer someone AND THEY BOOK...that after their cruise (to make sure they booked and sailed), you would like some kind of "goodie".
I should add that I refer folks to my PVP (and have for years) lots of them have booked and now use him exclusively and he has offered to send me "stuff"....but all I ask of him is to find me the best price and to watch that price for reductions .....
COMPLETES THE FLEET
If it is Carnival and it floats....we have sailed it!
Hubby ... DIAMOND (every ship except the Carnivale)
Me ... DIAMOND (every ship starting with the Tropicale)
20 year old son ... DIAMOND (every ship starting with the Tropicale...he is the only DOUBLE Milestone under the age of 21)
24 year old son ... DIAMOND
Sorry, but no matter how many referrals you give a PVP, they cannot change any price. They can take the time and effort to find the best price you qualify to get. But it will be no different than anyone else with the same qualifications.
PVP's get 'points' for bookings, not commissions.