In order to manage a purchase, please refer to the storefront where the original purchase was made. Here are some links to manage a purchase with the App Store or the Google Play Store:

Apple: https://support.apple.com/118212
Google Play: https://support.google.com/googleplay/answer/2850369 

Each storefront will handle potential queries such as refund requests in accordance with their own terms of use. If there is any trouble with managing a purchase there, please contact us and we’ll do our best to assist.