Generally refunds are a bit tricky, so it's best if you are really certain you want an item before purchasing it through the game!
According to the Google Refund Policy you may request a refund within 48 hours of the transaction if something you bought isn’t working, isn’t what you expected, was bought by accident, or you changed your mind about the purchase. You will find more information on refunds and the google play policy under the LINK EMBEDDED HERE
When making a purchase through the app store you forfeit your right to refund which is stated during the purchase process. Please make sure to always read all policies and Terms of Service
before making a purchase.
Please note that Vivid Games is not obliged to refund purchases made through the app and may provide such service only in rare and signifiant cases at its own discretion.