You can pick the most suitable period for you by yourself.
It can be NET 7, 15, 30.
There are available only NET 15 and NET 30 by default.
After you receive 2 payments on NET 15 basis you will be able to pick NET 7 period.
On NET 7 basis reqests are created on - 1, 8, 16 and 24 for the 24-31, 1-7, 8-15 and 16-23 periods.
On NET 15  basis reqests are created  - 1 and 16 for the 16-31 and 1-15 periods.
On NET 30 basis reqest is created on the first day of each month.

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