The integration will be done in a number of ways.
1) We will be creating an experimental MMO server that allows you to spawn a new character at the cost of some Dogecoins. The dogecoins you pay in will be randomly distributed throughout the game world as a mineable resource. Which means that you can actually make money by playing the game. Not only will you be able to mine Dogecoins in-game, but you will be able to trade them with other players, or even attack players and loot their coins.
2) We will also be allowing for custom servers to be created where all players who join the server have to pay a buy-in in Dogecoins, and the player who survives gets to keep the coins at the end of the game.
3) Finally, the standard MMO server configuration will allow players to simply deposit coins into their characters so they can buy things from other players in-game. With this configuration, players won't need to mine the coins first. There will be some limitations on this configuration however. Players won't be able to remove coins from their character whenever they want. There will be a period once the coins are acquired that they will need to stay in the character's inventory. This is to keep players from stealing coins, and then removing them from the game so they cannot be taken back. Coins will also only be able to be removed in batches. For example, if the batch size is 1000 coins, and a player has 1200 coins in his inventory, he will only be able to "cash out" 1000 coins. The purpose of this is to keep at least a small amount of coins on the character available to be stolen/looted by other players. (Keep in mind that 1000 doge is currently worth about 40 cents)