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Use Composer package
stamina/chequer-php to install.
php composer.phar require stamina/chequer-php
The minimum required PHP version is 5.3. Because 5.4 introduces the shorthand array syntax - this version is recommended and used in this documentation.
In a more traditional manner, you can add the Chequer library to you include path, or auto loader, as it is
PSR-0 compliant. You can also use a single file
Chequer.php, as long as you refrain from using typecasts.