A free app for Android, by Fun Techno.
GB Version Whatspro is a tool that lets you download Whatsapp Business and use it as if you were a regular user. You can use two Whatsapp accounts at the same time, so you can talk to two different people at the same time. You can also use the GB Version to make screenshots and share them with your friends.
You will be able to see all the messages, including those that you haven't read yet. You can also set a date to read your messages, so you can decide when to look at them.
This tool is not a hack and does not break the law.
