This page is just a reference of all the known Steam APIs, I do not know how they work. Please do not email me with questions.
GETGetNextMatchSharingCode
https://api.steampowered.com/ICSGOPlayers_730/GetNextMatchSharingCode/v1/
NameValueTypeRequiredDescription
uint64 Yes The SteamID of the user
string Yes Authentication obtained from the SteamID
string Yes Previously known match sharing code obtained from the SteamID
UNDOCUMENTEDGetPlayerProfile
https://api.steampowered.com/ICSGOPlayers_730/GetPlayerProfile/v1/
PUBLISHERGETGetPlayerProfileCoin
https://partner.steam-api.com/ICSGOPlayers_730/GetPlayerProfileCoin/v1/
NameValueTypeRequiredDescription
uint64 Yes The steam ID
string Yes The coin