Building a native HubSpot API integration can be a complex task, but with the right guidance, it's achievable. To get started, create a HubSpot developer account and OAuth app, which allows you to access customer data without worrying about messing up their account. The HubSpot API has various endpoints for reading and writing data, including authentication, associations, properties, filtering, and sorting. However, rate limits and nuances apply, making it essential to handle these complexities. To simplify the process, consider using a platform like Nango, which provides a single API for all integrations, handles OAuth and data sync, and offers observability and debugging visibility. By following this guide and leveraging resources like Nango, you can build a reliable HubSpot integration that meets your customers' needs and integrates seamlessly with your SaaS product.