Step 1. Open the link to Viber Admin Panel, enter the phone number, for which you have created a public-account in the messaging app, and click on "Login"
After that you will receive a 6-digit password to your Viber application, which you should enter within 2 minutes
Step 2. Click on «Сreate Bot Account», fill in all the necessary fields, tick the box I accept the Terms and Conditions and click on "Create"