Google Play gets a New feature Called Purchase requests which intends to simplify the purchase process for accounts that do not have the family payment method defined. With the new purchase requests feature, children in a family will still be able to send a purchase request directly to the family manager for approval even if no family payment method is set up. Previously, family members had to use the family payment method to make purchases for apps and in-app purchases (IAPs) on Google Play.
The family managers will receive notifications about these purchase requests in real time. After receiving the applications, they can evaluate them and decide whether or not to approve the purchase. Children can request permission to purchase paid apps or items sold within apps. This does not include purchases of Play Books, Google TV or a subscription.
If they approve, the person can use their stored payment methods, including Google Play gift cards, and complete the purchase. If not immediately, the administrator can add it to the approval request queue to decide later.
Google says that just like with the family payment method, transactions completed through purchase requests will all be available in your order history. Also, the child will receive a purchase confirmation email to the Google account he used when requesting the purchase confirmation.