IamA former manager of Papa John's (2 years) and Dominos (4 months), AMA!
My short bio: I managed pizza chains for a while because I make poor life choices.
edit: because I'm getting this one a lot, to make a decent garlic butter sauce saute a few cloves of peeled/minced garlic until it starts to get soft, cut the heat to a really low simmer, add two entire sticks of butter, some basil, some parsley, and some salt. The heat should be just enough to melt the butter and not much more. If you prefer garlic powder skip the first step and mix in a lot of garlic powder with the spices. You'll have to fuck with the amounts of everything to get it how you want it, I can just eyeball it so I have no idea how much of everything exactly. Put in a bit and taste, adjust, taste, adjust, taste, etc. until it's right. If you're using it on a crust/bread you'll want to add parmasean to it.
Papa John's uses margarine, not butter. Butter tastes better. It's up to you. If you care, I'm reasonably sure PJ garlic butter sauce is actually vegan.
My Proof: pay stub from Papa Johns
I don't have a pay stub from Dominos because the location I worked for pays under the table.