How to costumise the sound of an app message notification

[AC Question]

For example if I want to change the sound of the"eBay" or any other app. notifiation mesggs' sound. How do I do it, step by step on my galaxy S5 ?
Thank you
Andrew.

 

[B. Diddy]

Welcome to Android Central! Open the app and check its settings for an option to change the notification tone (but be aware that not all apps let you change the tone). If you want to add a custom tone, see this guide: http://www.androidcentral.com/adding-your-own-custom-sounds-android