Map entities to API DTOs in API Platform v4 with the Symfony Object Mapper (#[Map], stateOptions) for decoupled input/output contracts
Implement API Platform filters - v4 Parameters API (QueryParameter) and legacy
Configure API Platform v4 resources with explicit operations, pagination, and typed OpenAPI for clean, versioned REST/GraphQL APIs
Secure API Platform resources with security expressions, voters, securityPostValidation, and operation-level access control
Control API Platform serialization with groups,
Master API Platform v4 State Providers and Processors (ProviderInterface/ProcessorInterface) to decouple data retrieval and persistence from entities
Test API Platform resources with ApiTestCase; assert collections, items, filters, JSON schema, and authentication
Evolve API Platform APIs via deprecation (deprecationReason/sunset, RFC 8594/9745), the recommended alternative to versioning; plus path/header strategies