Could someone please tell me the word for what a person is called who is arranged to place the first call and place an order in order to make others believe that the product is really a good one to buy.
To give you a context, in the movie "JOY", when the protagonist goes on about how to use the mop, her friend calls her and asks questions which in turn causes others to start calling about the mop.
I would like to know the word.
Thanks