any independent sky contractors can answer this for me??

My sis is getting sky in and is using a local sky contractor. I seen the new offer fatcheese have for sky and that you can ring sky with your order if your in an apartment and then confirm your customer order number on the site to avail of the deal.

My question is if she was to put in the customer number she gets off the independant contractor and put that in the fatcheese website would that affect him getting his pay or commision he gets from sky??? She wants to give it a go see if it works but not if it will interfer with sky paying him.

thanks