1.Need to instal ngrok in computer
https://ngrok.com/download
2.Download ZIP file
3.Unzip ngrok from the terminal
4.You should register to find out your token
5.Add authtoken
6.Start a tunnel
ngrok http 8080
7.You must copy forwarding link
8.Past forwarding lik to ServerCallbackURL with callback method
9.run app
go run client/main.go