After your listing has sold and the buyer has made a payment, it's time to transfer your iOS and/or Android app to its new owner. 

Summary:

• To transfer an iOS app please refer to Apple's OFFICIAL guidelines that can be found here: https://help.apple.com/app-store-connect/#/deved688524f
• To transfer an android app please refer to Google's official guidelines that can be found here: https://support.google.com/googleplay/android-developer/answer/6230247?hl=en 

Detail:

Please note that Flippa can only provide limited advice for asset transfer and any advice should be followed up and verified as it is purely provided as assistance and not absolute direction. The exact process and nature of transfer is the responsibility of buyer and seller and should be discussed and agreed upon by both parties.