Is this a write off

I borrowed working capital loan from Shopify and they take out a fee for every sale until I pay back the loan. My accountant said I don't add those daily fees up and claim them as business expenses. He only adds the original fees taken out from Shopify and PayPal as merchant fees.

I thought I would add up my daily working capital fees, Shopify daily fees, and PP daily fees and use that as business expenses. Any advice?