Kelly Walls, the beautiful Kiwi I shot at Rose Bay in Sydney, Australia
Playboy generally pays between $500 to $1,500 to the model for pictures their photographers shoot for their magazine(s) like the special additions or "girls of..." (obviously not a centerfold shoot). You may or may not be paid for shots done by others and submitted to Playboy for internet use, it depends on the arrangement the photographer makes with you. When I shot on assignment for Playboy's internet site in Australia prior to the 2000 Sydney Olympics, the models were paid $500 directly by Playboy.
I would give you more information but without any images or vital statistics of you available it is impossible to know whether the it would be of any value. Put up some basic pictures and information (age, height, measurements, hair and eye color, location, etc.) and perhaps someone could be of more assistance. Those images should include a few face shots (smile and show those teeth!) and a few body shots (swimwear is fine) and should include a full length which shows your legs.
I have no idea what other magazines pay for nude images.