How to price revshare for a B2B SaaS

We're developing a SaaS which is intended for the use of application developers, around the world of notifications (refraining from adding more details to avoid self-promotion).

Has anyone had any experience with affiliate agencies/outsource development companies getting percentages of your revenue when integrating your product on their customers' applications?

If so - what are the standard percentages and time limits for such rev share engagements?
Anything other tips you can share for implementing such agreements are very welcome as well!

This feels particularly useful as we are getting many inbound leads from such companies/agencies via LinkedIn.