Ask HN: Affiliate Program Recommendation?

We're looking for an affiliate program for our BigCommerce Web store.

We're looking at Refersion for a couple of reasons:

Refersion Pay - automatic payment and tax document processing. I haven't found a comparable service elsewhere.

Highly customizable - we'll be integrating the affiliate program with several systems and need significant customization capability which Refersion has.

Are there any other affiliate program candidates that you're aware of that we should look at?

Thanks.

Tom