Ask HN: Affiliate Tracking for Service Providers

I run a business services company and find it extremely difficult to track referrals and pay my affiliate partners because current affiliate tracking systems are based on checkout gateways and many services leads call in or have a long conversion process. What are your thoughts on an affiliate tracking system that integrates with Callrail and Google Analytics to more intelligently track leads and conversions for cost per lead affiliate payout for service providers (E.g. home services, professional services, healthcare providers, ect.)