The required fields to map in Bank Positive Pay (non-profiles) are:
• Check number
If you are using profiles for your import, see Profiles.
Use Amount_Reverse_Sign when needed
Negative amounts decrease your balance.
Positive amounts increase your balance.
If the Excel or other file that you are importing is displaying the amounts in positive format, and the transactions represent payments out, then map the field as 'Amount_Reverse_Sign'. This has the effect of multiplying the amount by a negative 1.