How to accurately record client referral discounts?

We offer Clients a fixed-rate referral bonus (deduction from invoice). Is it best to record these as Discounts under the Income Chart of Accounts, or as Products & Services under Sales?
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We offer Clients a fixed-rate referral bonus (deduction from invoice). Is it best to record these as Discounts under the Income Chart of Accounts, or as Products & Services under Sales?