A spy's work is varied. They get paid per job, sometimes higher and sometimes lower. The value of the information often determines the value of the payoff. However, work is not steady, so average pay is lower.
and pays 3 GM per day
The other one has the description
There are always people wanting to gain an advantage over others. Some merchants wish to learn more about their competition and perhaps sabotage them. Governmental figures do the same. Whoever the target, when one employs another for the purpose of spying they are trading in information. (While a number of skills can aid here, Intelligence is rquired to gain access to this occupation.)
And pays 6 GM per day
Is there a difference between the two, or is it a mistake? If so, which one is correct?