Abstract: An integration platform, which integrates heterogenous provider systems behinds a normalized interface, accepts a declarative mapping template that specifies field-level relationships and transformations between provider schemas and a normalized schema. The template is validated and processed into compiled transformations. Executing the compiled logic converts provider payloads into the normalized schema for client consumption and applies reverse transformations to map client-supplied normalized data back to provider-native schemas for submissions. Client queries and ordering requests expressed against normalized fields are translated into intermediate, provider-agnostic representations that normalize keys, operators, directions, and typed values. These intermediate filter and order representations are then formatted into provider-native request syntaxes for transmission to provider systems.