src_findinng and src_trading and src_shopping have been created with https://github.com/WsdlToPhp/PackageGenerator
./wsdltophp-php5.phar generate:package --urlorpath="http://developer.ebay.com/webservices/latest/ebaysvc.wsdl" --destination="/app/MySdk" --composer-name="myproject/mysdk" --force
the rest are wrappers to make this auto-generated stuff working.
this is only for testing!
see test.php for examples.