create account on heroku
install heroku cli
after fill script with your token and page id do in folder:
git add .
git commit -m "init"
heroku login
heroku create
git push heroku master
get link for your app from heroku
Go to group in vk
select API usage
select Callback API
Fill address with link from heroku (add in end of link '/vk/callback
')
get confirm code from vk
at 15 line add
return "<your confirm code>"
After that update code on heroku:
git add.
git commit -m "confirm"
git push heroku master
click confirm on vk
remove 15 line
git add.
git commit -m "work mode"
git push heroku master
Enjoy.