Add metadata parameter to Direct Stripe charge

ds-charge-metadata.php

<?php
/*
 * Add metadata parameter to the Direct Stripe button
 */
add_action( 'direct_stripe_charge_data', function($data, $user, $token, $button_id) {

 $data[] = array(
		"metadata" => array(
			"key" => "value"
		)
	);

  return $data;
  
}, 10, 4 );