Mapping Rule (mapping)

Maps data from source columns to destination columns.

Field	Description	Required
columns	Array of mapping objects with source and destination columns	✅ Yes

Example:

{
    "type": "mapping",
    "columns": [
        {"source_column": "first_name", "destination_column": "fname"},
        {"source_column": "last_name", "destination_column": "lname"}
    ]
}

Behavior: Copies data from first_name to fname and last_name to lname.