Buying an item again despite having already purchased it. [HELP]

[beastcarving]

This code makes it so that Garry's love point are infinite after only purchasing 10 points. Ho do I make it so the user has to continuously buy Garry's points, instead of permanently unlocking the ability to have FREE points at your fingertips?

Code: Select all

label Garry_date :
    if iap.purchase ("garry_love"):
    if iap.has_purchased ("garry_love"):
       $ Garry_love +=10
    return ("main_menu")

How do I make so the user has to buy the item again and again to gain more points with Garry to unlock his dating game?