The answer is commission. Milady's definition matches the question directly: in a commission compensation structure, the employer pays you a percentage of the gross service sales you generate.
The book notes commission is usually offered once an employee has built up a loyal clientele, and that commission wages are typically paid as a straight percentage of total fees taken in for services. Salary-plus-commission, by contrast, guarantees a base salary on top of that percentage — the key difference is that plain commission has no guaranteed base.
Milady Standard Barbering, 6th ed., Ch. 20 (Working Behind the Chair), p. 740: "In a commission compensation structure, the employer pays you a percentage of the gross service sales you generate."
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