The PayPal Express Checkout API allows merchants to streamline the checkout process. When customers check out, they are redirected to Paypal.com from the merchant's site and then returned to the merchant's site for payment confirmation. Developers will need to have a PayPal merchant account in order to use this service.
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The PayPal Express Checkout Ruby SDK by PayPal is a gem that allows developers to integrate the PayPal Express Checkout API into their Ruby applications. Rails 4+ is not supported due to backward compatibility concerns.