Initial release
Use -> to call instance methods
Add PHP 5.2 compatibility
Remove underscore from invoice_item
Remove compat layer and corresponding get_called_class calls

The result violates DRY somewhat, but it should be PHP 5.2 compatible.
Bump version
Fix broken retrieve method
Make 4242424242424242's into strings

On a 32-bit platform, 4242424242424242 exceeds MAXINT.
Switch to Zend naming convention
Add customer saving test case
Remove closing ?>
Add underscores before private / protected method names
Provide get / set methods for global API key
Move curly braces around function/class bodies onto their own lines
Move around Errors
Change Ruby -> Php
Bump version
Update usage
Correct path to bundled CA file
Changed old path src to lib in usage example.