Accept donations on the “cart” with amount specified by the client, so they can donate any amount the wish .
Plugin for woocommerce that easily integrates with the template design you have already
Possibility to chose an existing non-shipping , no-taxable , not viewable OR to create a new product with the above properties from the plugin itself
Every step explain on the readme.txt and also graphically
Just enable the plugin and you will find the “Donation” field on the cart