ISteamSpecialSurvey – Steam Web API Documentation

https://partner.steam-api.com/ISteamSpecialSurvey/CheckUserStatus/v1/

Name	Value	Type	Required	Description
key	click to set	string	Yes	access key
appid		uint32	Yes	appid of game
surveyid		uint32	Yes	ID of the survey being taken
steamid		uint64	Yes	SteamID of the user taking the survey
token		string	Yes	Survey identity verification token for the user

https://partner.steam-api.com/ISteamSpecialSurvey/SetUserFinished/v1/

Name	Value	Type	Required	Description
key	click to set	string	Yes	access key
appid		uint32	Yes	appid of game
surveyid		uint32	Yes	ID of the survey being taken
steamid		uint64	Yes	SteamID of the user taking the survey
token		string	Yes	Survey identity verification token for the user