[DaneAMattie]

some little mistakes i think:
use this

pawn Код:

if(strcmp(cmd, "/buycc", true) == 0)
    {
        if(IsPlayerConnected(playerid))
        {
            if(PlayerInfo[playerid][pCreditCard] == 0) //you need 2 == in if statements and don't use ; after a if
            {
                PlayerInfo[playerid][pCreditCard] = 1; // SetPlayerInfo is not a function i think
            }
            else //you had else if, else if wut? nothing so else
            {
                dini_IntSet(string3, "CreditCard",PlayerInfo[playerid][pCreditCard]);
        }
        }
    }