How to see cleared iPhone notifications

Notifications are not stored or saved anywhere, and they are not part of either an iTunes nor iCloud backup. When you dismiss a notification, it’s gone. There’s no getting them back since they no longer exist anywhere.

Contact the developer of Whatsapp since it is not an Apple product.

Do you have a backup made when that information was present?

If so, restore the backup. Be advised that restoring a backup will

overwrite all information newer than what is contained in the backup.

Michael Blackgave you the correct answer. I missed the

word 'notifications' and my answer would not help your

situation.