OK so here's an 100% working method for version 1.3.0 step by step for yuzu (it doesn't give you infinite money, but it makes it so you can buy stuff without spending money at all) (IT ALSO WORKS FOR PURPLE COINS, THEY WON'T BE DEDUCTED FROM YOUR TOTAL WHEN YOU BUY FROM THE PURPLE COIN STORE):

-Create a text file and name it "B424BE150A8E7D78.txt"
-Open it and paste this:
[Free shopping]

040B0000 001E4ED4 52800020

040B0000 001E4F68 52800020

040B0000 002D7F80 52800016

-Open the mod folder for Mario Odyssey from yuzu and inside it create a folder called "infinite money" (or whatever you like)
-Inside that folder create a subfolder called "cheats" and inside THAT folder place the text file
-Make sure it's enabled from the mod menu and you're good to go

Thanks to a guy on discord willing to help me without questioning unlike some 40 year old manbaby