Ahoy! For tracking users' signups and billing while unraveling insightful data, tools like Google Analytics or Mixpanel could be your GPS in the maze of user behavior. Just like a tech-savvy detective, these tools will help you crack the case of user activity!
I don't know if they currently offer a specialized sign-up and bill tracking service but @fireberry_crm can be used as a customizable tool to track your users. In addition, to track user feedbacks, insights and analytics you can reach @paulinahryniewicz to learn more about Insights Hub. But if you are searching for apps like UX mapping, you can visit apps like Dynatrace.