PayPal NVP Web Samples Using PHP
Change Log 
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Version 5.3.65: 10-14-2010
API version change to 65.1
Upgraded to PHP 5.3, it's now compatible with PHP 5.1.2 and higher
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Version 5.3.64: 09-21-2010
Permissioning support is added to authentication mechanism
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Version 5.2.64: 07-12-2010
API version change to 64.0
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Version 5.2.63: 05-03-2010
API version change to 63.0
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Version 5.2.62: 03-02-2010
API version change to 62.0
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Version 5.2.61: 01-12-2010
API version change to 61.0
JPY currency issue fixed in EC
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Version 5.2.60: 12-29-2009
Reference Implementation Includes Recurring Payments, version overrride, Third Party calls and 3D Secure(for UK merchants only) API features.
API version change to 60.0
 - line item deatils in the shopping cart page for EC samples
 - UniPay support
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Version 5.2.59: 7-25-2009
API version change to 59.0
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Version 5.2.58: 6-25-2009
* version update to 58.0
* Reference Implementation Includes Instant Update API features
   - line item deatils in the shopping cart page for EC samples
   - SetEC and GetExpressChecoutDetails API calls use Instant Update API for shipping
   
API Parameter Typo Bug: Typo in the Shipping Option Label parameter in SetEC
(for flat rate shipping parameters):Typo: shipingpoptionlabel
(Target fix timeline: 59.0, around Aug 18, 09.  Afterwards, we will support both the 
typo version and the correct spelling version for backward compatibility.)     
   
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Version 5.1.57: 03-25-2009
version updated to 57.0
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Version 5.1.56: 01-28-2009
version updated to 56.0
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Version 5.1.2: 03-28-2008
GetBalance API added.
version updated to 51.0
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Version 5.1.1: 04-14-2007
Minor look'n'feel changes
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Version 5.1: 01-14-2007
Added samples for DoCapture, DoVoid, TransactionSearch, Refund, MassPay and ReAuth
Proxy support provided
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Version 5.0: 10-23-2006