First connection
What the connection string is made of, and how to check the proxy works.
What you were given
After payment the order page shows four things: username, password, the gateway address and port 823. The same details are in “My access” and in the access email. There is nothing else to configure — this is an ordinary HTTP proxy with username and password authentication.
The same credentials work in all 225 countries and in every program at once. There is no per-device connection: only traffic is spent.
One command to check
Substitute your own username and password. The reply carries an IP address and a country — that is the address sites will see.
curl -x http://LOGIN:PASSWORD@HOST:823 https://ipinfo.io/jsonHOST is the gateway address from your access; LOGIN and PASSWORD are your username and password. All three are on the order page and in “My access”.
If nothing comes back
Check that the username and password were copied whole, with no trailing space. The password goes into the string as is; no quotes are needed around it.