I'm afraid I don't have an answer for the price of long-term parking at POP. It seems to be a closely guarded secret, but if you find out how to do it and what is the cost I would like to know too!
Just dropped a friend off at POP. Didn’t see a day rate posted. Just hourly rates for different types of vehicles. Cars were 35 pesos an hour. It did say 450 pesos for a lost ticket, and 3000 pesos for some other (infraction?).
$175 DP per 24 hours thereafter. Suggest you speak with an Aerodom Supvr. of Operations prior to departure to ensure the car doesn't get towed. They can also advise you where and to whom you pay.