This sounds like a great Show & Tell share, @informedhousehold… if you’d be willing to write it up.
For Paypal, @syada, do you use the Tiller Money Feeds integration or the Line Item Importer workflow? If you use the latter and you can find the transaction fee field in the PayPal CSV, I can add it to the data reported in the Metadata column of the reporting output. You’d still need a script or workflow to move it from the primary transaction row to a split but the data would be included in the sheet on import at least.
Unfortunately, there are no imminent plans to provide automated Stripe reporting.