Blancco 5 Mobile erases the device completely including credit/debit cards that have been added for Apple Pay, photos, contacts, music and apps. Blancco 5 Mobile also erases everything on the device related to iCloud, iMessage, FaceTime, Game Center and other services.
Ideally, the previous owner should carry out the following tasks before selling or giving away the iPhone, iPad, or iPod touch: https://support.apple.com/en-us/HT201351