WhatsHelp enables your visitors to contact you through popular messaging apps such as Facebook Messenger, Whatsapp, Snapchat or Viber through a single widget.
To install the chat button, go to https://whatshelp.io/widget and follow the instructions to get the code.
After getting the code in the email, go back to your landing page and insert an HTML element:
Then paste the code inside.
The widget will appear either on the bottom left or the bottom right corner of your page depending on the option selected when customizing it.