Downloading Payment/Order reports in Excel format

Are you asking about the Order Reports in the Seller Central or in your Amazon Payments account?

Here you can review the Amazon Payments help page on generating reports:

https://pay.amazon.co.uk/help/202121460

In the Seller Central, when an Order Report is ready, click the Download button and save the file to your local hard drive. You can then open it in a database or spreadsheet program, such as Microsoft Access or Microsoft Excel.

https://sellercentral.amazon.co.uk/gp/help/help.html/?itemID=G201648770&ref_=ag_G201648770_h_r0_cont_sgsearch