YITH Donations for WooCommerce Premium v1.0.12

Due to the constant increase of e-commerce shops, online payments become more and more secure and so also the possibility to make donations.
Besides charity associations and non-profit projects online, also owners of medium size e-commerce sites may need such a way of money transfer (think you are giving a free product and you want to give users the possibility to contribute freely to finance your work).
And you know how difficult it is, if not even impossible, to set your e-commerce shop so that you can allow a payment of a variable amount, amount that users themselves choose just before paying.