Add a column to the Event Espresso 4 Registrations CSV report. The added column will display the selected method of payment (even before payment is actually made)

espresso_add_chosen_payment_option.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_filter(
  'FHEE__EventEspressoBatchRequest__JobHandlers__RegistrationsReport__reg_csv_array',
  'espresso_add_chosen_payment_option',
  10,
  2
);
function espresso_add_chosen_payment_option( $reg_csv_array, $reg_row ) {
  $selected_payment = '';
  if ($reg_row['TransactionTable.TXN_ID']) {
    $selected_payment_obj = EEM_Payment_Method::instance()->get_one_by_ID(
      $reg_row['TransactionTable.PMD_ID']
    );
    if ($selected_payment_obj instanceof EE_Payment_Method) {
      $selected_payment = $selected_payment_obj->get('PMD_name');
    }
  }
  $reg_csv_array['Selected Payment option'] = $selected_payment;
  return $reg_csv_array;
}