A comparison of PayPal and Google Checkout API implementation documentation:
Paypal:
Your third-party SOAP client generates business-object interfaces and network stubs from PayPal-provided WSDL and XSD files that specify the PayPal SOAP message structure, its contents, and the PayPal API service bindings.
Google:
Once you update your website’s HTML with the Buy Now code, you can start accepting orders and processing them through Google Checkout immediately.
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