When selecting a SaaS provider for integrating with existing workflow tools, API accessibility and compatibility are crucial factors. A robust API enables seamless integration with existing systems, ensuring that data flows smoothly between the SaaS application and other enterprise tools. This compatibility helps in maintaining business processes without significant changes, which is vital for the effectiveness of the new software solution. While scalability, support for mobile platforms, and data encryption are important, they do not directly address the primary need for integration capabilities with existing workflow systems.