I tried to get Contact records:

ZCRMRestClient::initialize(); 

$zcrmModuleIns = ZCRMModule::getInstance("Contacts");

$bulkAPIResponse=$zcrmModuleIns->getRecords();

$recordsArray = $bulkAPIResponse->getData(); 

but I get this error:  Uncaught ZCRMException Caused by:'Unknown ZCRMException'

httpStatusCode: 302