Custom API integrations involve synchronizing non-standard objects and fields to meet specific integration requirements, either internally or between a product and client applications, often requiring complex data transformations and mapping fields, which can be time-intensive and challenging to scale. These integrations can enhance efficiency, reduce errors, and improve customer satisfaction but come with the burden of maintenance and potential errors that developers must manage proactively. Organizations have the option to build these integrations in-house or use third-party solutions like the Merge Unified API platform, which simplifies the integration process by normalizing third-party APIs' data models and allowing for easier management, maintenance, and customization through features like Field Mapping. Custom API integrations differ from standard APIs by offering tailored endpoints for specific clients, and while they share similarities with custom integrations, they exclusively use API endpoints. The Merge platform not only facilitates the creation of customizable API integrations but also serves as an integration management tool, providing businesses with a more extensible solution to handle customer integrations effectively.