I see in the MCC Shop that each thing gives you a certain amount of credits, what do they do and how can I use them?
Helloo! You probably are referring to MCC minigames credits, every time you play game, you will get credits depending on how well you do or how many kills you get. You use those credits by right clicking the emerald and buying certain perks and abilities to gain an advantage. They only apply for minigames and not the sub servers. If you have purchased all your perks/abilites with your credits and you have extra, I am afraid all you can do is hold on to them as they are no use. When you purchase a rank or upgrade it, it will come with a certain amount of credits. $1 = 100 credits. I suggest purchasing the lapis rank or higher to get 2.5x the credits you get in game. Be sure to vote to get 500 credits! Have a great day/night! Note: Not all minigames have emeralds/certain perks and abilities. (Murder Mayhem, Speedy Walls...)
It should also be noted that you will gain one server level for every 1000 credits (you can see it next to your name when you chat and on the scoreboard.
Credits are used in the older minigames (CTF, Skywars, Survival Games) to purchase perks, starting gear and other goods within these games. To access the purchase menu, go to the waiting lobby and right click the emerald in your hotbar, which will then pull up the menu. They can be collected in three ways: gameplay, voting and rank purchases. During gameplay, you will receive a certain amount of credits for every kill or win (for example, you get 25 credits per kill on Skywars and Survival Games, and 5 on CTF). If you have purchased a Lapis rank or higher, you will receive double the credits. If you have Bedrock rank or higher, you will receive 2.5x the credits. If you vote on all four portals successfully, you will receive 500 credits. This can be done once a day, and the players with the most votes in a month get a $25 giftcard to the MCC store. When you purchase a rank, every US dollar spent on the rank (regular price) will give you 100 credits. For example, if I was to purchase the Iron rank ($10 USD), I would also get 1 000 credits in-game. The same rule applies to rank upgrades, but not keys, pocketpals or other purchases. You can read more about credits on the MCC wiki page here.