Problems with in-app purchases

How Do I Request a Refund? How Can I Find My Google Play Purchase Receipt? How Can I Find My Apple App Store Order ID? Rules on in-app purchases and cancellations Where can I check my purchase records? I didn't get an item I purchased! I can't buy anything. (Purchase Error) I closed the game while making a purchase. Was my purchase cancelled? I accidentally used an item, can I get it back?