Customer Relationship Management (CRM) systems are a crucial part of go-to-market operations, and integrating them with other software applications is essential for businesses. The CRM market is comprised of several sub-markets, including sales, customer service, marketing, and digital commerce, each with its own set of major vendors. To integrate with CRMs, it's necessary to understand key concepts such as leads, contacts, custom objects, and fields, as well as data schemas that organize customer information. Common use cases for CRM integrations include marketing campaign management, lead and account prospecting, routing and meeting scheduling, customer communication, sales and support productivity, ecommerce campaign management, contracts and quotes, billing and payments, help desk and ticketing, and customer health and churn management. When getting started with CRM APIs, it's essential to consider factors such as API format, authentication, pagination, rate limits, and test accounts, and using a unified API like Merge can simplify the integration process by providing a single interface for multiple CRMs.