Integration Guide

Introducing Express Checkout
Express Checkout Building Blocks
3
28 April 2012 PayPal Payments Pro Integration Guide
A token is a value assigned by PayPal that associates the execution of API operations and
commands with a specific instance of a user experience flow.
NOTE: Tokens are not shown in the diagram.
PayPal Button and Logo Images
To inform buyers that PayPal is accepted on your website, you must place PayPal button and
logo images in your checkout flow. PayPal recommends that you use dynamic images.
PayPal requires that you use Check out with PayPal buttons and PayPal mark images hosted
on secure PayPal servers. When the images are updated, the changes appear automatically in
your application. Do not host copies of the PayPal images locally on your servers. Outdated
PayPal buttons and images reduce buyer confidence in your site.
Express Checkout Image Flavors
The Check out with PayPal button and the PayPal mark image are available in two flavors:
 Dynamic image
 Static image
The dynamic images enable PayPal to change their appearance dynamically. If, for example,
you have signed up to participate in a PayPal campaign, PayPal can change the appearance of
the image dynamically for the duration of that campaign based on parameter information you
append to the image URL.
The static images cannot be changed dynamically. To participate in a PayPal campaign, you
would have to manually update the image code to change the image displayed and restore the
default image when the campaign is over. The only way you can have image management
taken care of for you is to replace static images in your implementation with dynamic images.