A unified payroll API normalizes field names into one fixed schema. A context layer such as datascalehr keeps every field and the field’s meaning, works in both directions, and learns from every mapping decision.

A unified API turns “Employee_ID”, “EmpNo” and “Worker_Number” into one “employee_id”. Fields that do not fit the fixed schema get dropped or flattened, so a German payslip with dozens of statutory components loses detail.

datascalehr reads the structure of each source and keeps full field fidelity. datascalehr recognizes that a German social security contribution and a French “cotisation sociale” are both social security contributions with different rules. datascalehr writes back as well as reads, and KMod™ learns from every confirmed mapping (4M+ to date), so accuracy improves with every deployment.