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* Interface for CSV Importer
* @copyright Copyright (c) 2023, Code Atlantic LLC
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* Promise for structuring CSV importers.
* @see PUM_Interface_Batch_Importer
interface PUM_Interface_CSV_Importer extends PUM_Interface_Batch_Importer {
* Maps CSV columns to their corresponding import fields.
* @param array $import_fields Import fields to map.
public function map_fields( $import_fields = [] );
* Retrieves the CSV columns.
* @return array The columns in the CSV.
public function get_columns();
* Maps a single CSV row to the data passed in via init().
* @param array $csv_row CSV row data.
* @return array CSV row data mapped to form-defined arguments.
public function map_row( $csv_row );
* Retrieves the first row of the CSV.
* This is used for showing an example of what the import will look like.
* @return array The first row after the header of the CSV.
public function get_first_row();