The Windows 10 Mobile native Store app has received an update. The new version is 2015.9.25.1. The update doesn’t bring too many noticeable changes except than one in settings.
As you can see in the above screenshot, three is a new option of enabling a check while doing a purchase from the store. If enabled, you will be asked before making a purchase, thereby protecting you from accidental or unauthorized purchase from your devices using the store. There may be some bug fixes and performance improvements too.
Fire the store on your Windows 10 Mobile running devices to check for it.