Hello,
I am a statistician and R programmer. I have read your project description and here is an approach I can suggest for you.
So since the sales data is present on the website, it is possible to twist things.
It is better not to keep downloading the file each time and running the program just to get the profits.
What I suggest is that you web embed a file/program that does that. And the program will be updated regularly without you touching it.
For example this could be achieved using power Bi. The power Bi dashboard would have access to the data and would do calculations and produce charts.
When you log in to the websitebthat contains the charts, you will for example see a line chart of the sales and a daily total, a weekly total and a monthly total. Other charts could be used too.
This method makes it very easy honestly but it is quite lengthy and hard, but I am pretty sure if you share further details about the data the website produces I can help you.
Please share with me some of the data, not all of it if you don't want to. By seeing the data I can tell how I can do this.
Thank you, looking forward to hear from you.