I am having issues with Karma Koin Follow If you are having any issues regarding Karma Koin, please contact their Customer Support Department. Once here, just fill out the required fields and hit the submit button. Related articles Where do I purchase NX? Why did my NX Credit purchase fail (error code 002-400-0006)? Regarding Gremlin's Check-in Chance purchase restrictions What do I do if I receive Error Code 002-400-0005 after failing to complete an NX purchase? What Payment Methods Can I Use to Make NX Purchases?