WildGoldenEagle

Ok guys here's my dilemma, a youtuber in my country played WOWs and got from the people from tanchist site a code that's like 13 letters in one word and I have no idea about where I should use it, the guy does not disclaim if it's a bonus code or if it's for something specific or if it's an invite code and I don't know what to do. In case you help, I appreciate it, thanks.