Owl Order Service

"Fred and George send them disguised as perfumes and cough potions. It's part of their Owl Order Service."

- Mention of the order service Owl Order Service was developed by Fred and George Weasley in order to smuggle banned items form Weasley's Wizard Wheezes into Hogwarts School of Witchcraft and Wizardry. They did this under the nose of caretaker Argus Filch, disguising the products as perfumes and cough potions. Information regarding this service was explained on the back of the WonderWitch products the twins showed Hermione Granger and their sister Ginny in the summer of 1996.

History
Several girls spend the entire 1996-1997 school year deciding how to slip Harry Potter a love potion. They did this in order to get Harry to take them to Slughorn's Christmas party, and they all bought Fred and George's love potions. Romilda Vane tried to give Harry a love potion by spiking Chocolate Cauldrons with it. Filch had banned anything bought at Weasley's Wizard Wheezes and students did not pay attention to what Filch has banned.