I have clients who pay using payment links in Stripe etc. 

The payments have a processing fee deducted - which means the money that comes into my QB account is that fee less than the invoice amount. 

How do I show this fee on my invoice? 

For example (I know it's not the ACTUAL fee but for ease of example...)

£2000 invoice
Client pays Via Stripe. They of course pay £2000
Stripe takes their fee - say £50
Final amount I get into my bank £1500

QB can't then match the invoice because there is a £50 discrepancy between my invoice and what I got paid BUT the client of course has paid the full invoice amount. 

How do I show this charge on the invoice?