Ask HN: Would you pay for a referral program system for your business?

Hi there, looking for a referral program system for a side project of mine I came up with the idea of actually building one, since I didn't find many alternatives. Looking for this topic on HN I found two people who had already suggested something like this.

What do you think about it? Specifically: -Do you need a referral program system for your business? -Do you use one? Which? Did you roll out your own system? -How much would you pay for something like this? Flat or per signup? -Which features should definitely have the MVP? -How would you like the integration process to be? What steps would you expect, what steps would you definitely want to avoid?

I've been reading HN Micro-SaaS and solo founders posts for ages but never actually tried to build my own SaaS. If you found this idea interesting and worth pursuing I would definitely try it out, maybe this weekend I would do a hackathon and ship the MVP.

Also, I think it should very niche, I would be actually targeting small SaaS businesses.