Those should not be your concerns when all you have is a game idea. You should be focused on making the game. And at no point should be you saying, "I am making this game for the sole purpose of getting it onto Armor." There are tons of great sites out there and if you make a great game, you'll want to get the most for it and get it everywhere.
However, if you're thinking about a multiplayer game, I'd look into Player.IO; their infrastructure is great and relatively cheap.
And... to answer your stated questions: If your multiplayer game is going to be on Armor, you'll either need to integrate our API for SSO or have an in-game registration that is seamless. For the second, we do not have our own platform currency... as such, almost all games on Armor with payments use their own integration from a 3rd party (such as from the companies you listed).
We strive to deliver the best gaming experiences... on the internet and on your mobile phone. Play thousands of free online games, get access to free mmorpg games, online rpg games, fun online flash games, and more.
We offer free flash games in many different genres: online shooting games, online puzzle games, online war games, free online car games, free online hidden object games and dozens more.
This is the best place on the web to play online games for free... play on Armor Games! No matter what game style you prefer, we've got it here.
Review/Share our Games!
Gaming websites, passionate bloggers, and quirky streamers are welcome to share or review our games. If you need game keys, art, trailers, screenshots or more check out our
press kit website.
Submit a Game
Game developer? Visit developers.armorgames.com to request AG developer status, find documentation on our APIs, and get access to our development environment. Let's make sweet, sweet games together.
Mobile Game Developers
Looking for a publishing partner that can help your app rocket to success? Contact the mobile team to learn more about how we can help!