SPBAS

A complete solution for billing & invoicing, customer management, helpdesk, knowledge base, web hosting & domains, software licensing, digital goods delivery and e-mail marketing.

The objective with SPBAS is to provide a unified system to manage user interaction, starting with sales emails, moving through to purchase, and finishing with support and feedback opportunities. SPBAS is designed to automate the entire business workflow.

SPBAS provides a special plugin for integration with Post Affiliate Pro. You can find the manual here:
https://solidphp.atlassian.net/wiki/display/docs/Post+Affiliate+Pro