I'm not 100% sure what options itch.io offers because I have my account set for them to just handle all of that on my behalf because I wouldn't have a clue what to do >.< haha.
I have a Ko-fi account and a Patreon as well if they're any help at all :3 The links are on my dev page here: https://melancholy-marionette.itch.io/
I don't think I've heard of gcash before but I can look into it :3 Sorry, I'm not very clued up on that sort of thing >.< haha.