What did mercenaries contract look like?

by No-Shower-9314

Hi,

A college referred to modern freelance consulting, where we are paid by the hour, as "the mercenary model". Which I though was funny but now also got me wondering; what was the real historical contract model for mercenaries?

- On the level between individual soldier and the mercenary 'company'?
- Between mercenary 'company' and it's employer?

Maybe modern freelancers can take inspiration...

Broke22