CoinPayments is a checkout system for cryptocurrencies such as Bitcoin and Litecoin. Customers click on a link or button on the user's website and get directed to the CoinPayments checkout page to make the payment. Once the transaction is complete, CoinPayments sends the payment to the user, minus transaction fees. Users are notified of every step of the process via Instant Payment Notification (IPN) or polling. The CoinPayments API is designed to allow users to easily integrate the checkout system into their own websites.