[Konstantinos]

While OneDay's solution allows multiple letters to be used at once, for a simpler way of just M/K (or m/k) at the end, you can use custom sscanf specifier as well:

pawn Код:

SSCANF:money(k_string[])
{
    new k_length = strlen(k_string);

    switch (k_string[k_length - 1])
    {
        case 'K', 'k':
        {
            k_string[k_length - 1] = EOS;
            return strval(k_string) * 1000;
        }
        case 'M', 'm':
        {
            k_string[k_length - 1] = EOS;
            return strval(k_string) * 1000000;
        }
    }

    return strval(k_string);
}

pawn Код:

if (sscanf(params, "uk<money>", id, value)) return error_usage_here..