You can choose between three different api protocols. JSON, XML and
SOAP are supported by the zanox api. If no version is given the latest
version is always used.
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Usage example: creating api instance
use soap api interface and the latest version
$api = ApiClient::factory(PROTOCOL_SOAP, VERSION_DEFAULT);
use xml api interface and the latest vesion
$api = ApiClient::factory(PROTOCOL_XML, VERSION_DEFAULT);
use json api interface and latest version
$api = ApiClient::factory(PROTOCOL_JSON);
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