Online 3D game for mobile pc and consoles

Hi, I’m after a 3-D artist and programmer that can create a game for me in 3-D using unreal engine five and I want to be able to have members purchase in game products and earn reward points to spend in game

What is the cost to set up the data base for gamers to be able to buy items in game and then also earn points that they can use to spend on items? I have my own domain hosting and website but I need other costs to be able to run a multiplayer server etc.. Can you send me samples of your work that directly relate to what I’m asking In particular I want the database and purchasing credit card facilities covered too!!
I want a game where people can purchase items and earn points and I’m after costs for hosting it and where to host it???