Getting order fees

[matasbern]

Hello,

My first post here in general but wanted to thank this community for this project and your hard work!
Now I started building an application for a friend and this is first time dipping into Amazon side sales..

What I'm trying to achieve is to build some report to see what profits he gets based on certain products.
What I'm trying to get is all the shipping fees, amazon fees and other costs he occurs so I could include that in the report to see full breakdown.

I'm looking at two ways of doing this, but I feel like I'm missing something out. For example:

1. Using Financial.ListFinancialEventsAsync to get all the data posted between two dates.
   This gets me marketplace, date posted, a lot of other information including FEE and Charge costs as well as items sold. How much I can rely on this data as these are just the events?

2. Get SettlementOrders, but it seems like I don't get all the data I want between two dates? So from looking at documentation these get created automatically at the certain times. And for example, the report I just tried to get was missing 2 days worth of data I was expecting?

Am I missing something here or I should go with different approach? Any help from someone with more experience in this field would be greatly appreciated!