WAIT FOR UPDATE TO 2.1.0 DIrect Stripe Update Customer's Card Number in Stripe

ds_update_source.php

add_filter( 'ds_charge_action_payment', function( $action ) {

	$action = '\Stripe\Customer::retrieve';

	return $action;
		  
}, 10);

add_filter( 'ds_charge_content_payment', function( $content, $token, $stripe_id ) {

	$content = $stripe_id;

	return $content;

}, 10, 3);
add_action( 'ds_after_charge_payment_process', function( $customer, $token ) {
	
	$customer->source = $token;
  	$customer->save();
	  
}, 10, 2 );