How to record transactions fees ( not bank fees)

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Hi, I am new to Sage and I don't know how can I record in Sage my transaction's fees. I am using different platforms such as PayPal, Stripe and so on ...to cash in the money from my website orders. Let's say that I sold 1 item for £100 via Stripe, they take commission for each transaction, so they will send to my bank account the amount of £ 98.25. I registered the transaction as a sales order in Sage for £100 and when I have to associate it with my bank feeds , there will be this discrepancy of £1.75, which is basically their commission.  So how to account this discrepancy in Sage? Where and how should I record this fee, as this is not a bank commission fees ( not taken by my bank, but the card provider ). 

Thank you in advance.