To open Mercury you have to pair your account number to connect it to our Web App.
To pair the phone number follow this steps:
Open WhatsApp or WhatsApp Business on your phone
Click on three dots Menu or Settings and select WhatsApp Web
Point your phone on the screen and scan the Qr code
Wait a few minutes to synchronize the messages. Then the Mercury client opens with your WhatsApp chats. From now on you can start sending and receiving WhatsApp messages with Mercury.