Ask HN: Which user referral software do you use?

I run a service that has a great potential for more users with referrals, as our target segment is groups. Currently, we've integrated rewardful-dot-com, however, the service works only for the Stripe purchases. Is there any other services that offer to integrate with other Payment gateways like (RazorPay) or has the ability to accept the referral purchase by a webhook?