If you are from Spain, then you must know RedSys. This is the most widely and extensively used payment gateway in Spain. With the help this extension, you can easily integrate RedSys Payment Gateway to your WooCommerce store. It is also compatible with WPML. A must-have plugin for Spanish online stores based on WooCommerce.
This is the EXACT same plugin as distributed by the developer on WooCommerce. The developers’ links are provided above.