Seeing it in action is always going to be more impressive than words, so check out the Cryptocurrency Checkout demo resource here.
This service keeps all coins completely decentralized and peer-to-peer by allowing customers to pay directly to any wallets or addresses of your choosing, taking out any middlemen or additional fees commonly found in other payment gateways.
The best part, it has zero fees. Unlike Credit Cards and other payment gateways that upcharge for being a central processor, the only fees you will ever see are standard blockchain processing fees.
Users are given access to many helpful functions, including invoicing tools, activity graphs, transactions charts, API keys, and of course scripts for painlessly setting up a payment option.
Cryptocurrency Checkout currently is accepted for payment processing with platforms like Bigcommerce, Shopify, WooCommerce, Wordpress and others. Their donation services are integratable with platforms such as Twitch, YouTube, Twitter, Facebook, and Instagram. There are also step by step guides for each integration process.