2012

14 January 2011 PayPal Mobile Express Checkout Library Developer Guide and Reference
Method Sequence with the PayPal Button in Your Mobile App
The following diagram illustrates the sequence of methods that embed only the mobile PayPal
payment pages in a web view within your mobile application.
IMPORTANT: Never send Express Checkout requests from your mobile application directly to
PayPal. The requests require your PayPal API credentials. Placing your credentials on mobile
devices exposes you and PayPal to unacceptable security risks. Send Express Checkout requests
only from secure servers.