EDD FES Use Vendor Display Name As Store Name

fes.php

<?php // DO NOT COPY THIS LINE

/**
 * User vendor's display name for store name if unedited
 */
function sd_fes_store_name_username() {
	if ( class_exists( 'EDD_Front_End_Submissions' ) ) {
		$the_vendor        = wp_get_current_user();
		$vendor_name       = get_user_meta( $the_vendor->ID, 'display_name', true );
		$vendor_store_name = get_user_meta( $the_vendor->ID, 'name_of_store', true );
	
		if ( ! $vendor_store_name ) {
			update_user_meta( $the_vendor->ID, 'name_of_store', $vendor_name );
		}
	}
}
add_action( 'init', 'sd_fes_store_name_username' );