Legal Workflow System

API and Integration: Integrating with different Systems can be challenging due to varying APIs and data structures across platforms. Ensuring secure connections between 2 systems is crucial to protect sensitive client data. This includes encrypting data during transmission and complying with data security standards.

Building the Question Builder and Logic Tree: Developing a system that allows users to create complex question flows with conditional logic can be demanding, especially if it needs to accommodate diverse customer requirements. The user interface must be intuitive and easy to use, enabling non-technical users to build complex logic trees. 

Payment System and Billing Management: Integrating online payments, particularly with GoCardless, requires compliance with payment regulations and security measures, as well as ensuring accurate billing based on usage and recurring invoices. Setting up a system to track and calculate fees based on customer usage can be complex, especially if different pricing models need to be supported.

Security and Privacy: Since the system will handle client and legal data, security is paramount. Implementing robust security measures, including data encryption and two-factor authentication (2FA). The system needs to comply with data protection regulations, such as GDPR if serving European customers, and other laws related to personal and legal data protection.