installed composer, defined my composer.json { "require": { "php":
">=5.2.0", "ext-curl": "*", "authorizenet/authorizenet": "1.8.6.2",
"jms/serializer": "xsd2php-dev as 0.18.0" }, "require-dev": {
"goetas/xsd2php": "2.*@dev", "goetas/xsd-reader": "2....