WA Web Plus is able to restore WhatsApp deleted text messages that have been deleted while you’re online on WhatsApp Web!
To enable this feature, activate the “Restore deleted messages” function in the “Privacy” section at the “Enhancements” tab.
A trash icon will appear at the top of the conversations window, when a user deletes his message, click the trash icon to restore the deleted message!
Please note that this feature only restores text messages for now, and it doesn’t restore your own ones.