SOURCE: PayPal Introduces Open API to Put Payments Into Apps - Business Center - PC WorldThe new PayPal APIs allow developers to engage customers directly within their own applications rather than forcing them to port users off to the actual PayPal site. Users who don't even use PayPal can actually sign up for PayPal within the third-party application and begin making PayPal payments seamlessly from within the third-party application.
LINK: www.x.com (I wonder how much they payed for that domain)