Using the Steam API key manually on the server
Latest update 1618 Or version after
Go to http://steamcommunity.com/dev/apikey and in Domain name you put what you want then copy the key and then go to your server.cfg and put this:
# Steam Web API key, if you want to use Steam authentication (https://steamcommunity.com/dev/apikey) # -> replace "" with the key set steam_webApiKey "KEYS"
Replace KEYS with your keys
Well leave the " before and after the key
At the end restart your server is everything should work
For Zap Hosting you have to wait for it to update itself