What is the ruling on commissions that a tour guide takes from shop owners in exchange for bringing tourists, given the guide's knowledge that the shop owner raises the price on the buyer to cover these commissions, and considering that the company views these commissions as part or all of the guide's wages?

Working as a tour guide for tourists, even if they are disbelievers, and taking wages for it is permissible according to legitimate guidelines, whether the wages are taken from the authority responsible for the tourists or from the tourists themselves. There is also no objection to taking a commission from sellers for these tourists.