How to build API integrations with custom objects and field mappings

Custom objects are user-defined data models that extend CRM or ERP systems beyond their standard schema, necessitating adaptable API integrations to handle diverse customer data. Integrations involve discovering customer schemas, allowing customers to configure data mappings, and ensuring scalable data syncing. Discovering schemas requires listing and describing objects via metadata APIs, caching schema data, and managing changes through polling or webhooks. Customers configure field mappings using declarative, per-field code transformers, or full code-level transformation for complex cases. Syncing data at scale involves handling large datasets, implementing incremental syncs, respecting rate limits, and ensuring durable execution with checkpointing. Integrations also include writing back data, requiring conflict resolution, validation, and handling partial failures. Nango is a platform that facilitates these processes by providing a unified interface for managing auth, data syncs, and schema management across numerous APIs, allowing for quick implementation and scalability while managing ongoing complexities like schema drift and permission changes.

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