What is a valid way of referencing the CC Cart Object whose API name is...

A valid way of referencing the CC Cart Object whose API name is E_Cart__c in a SOQL query is to useccrz__E_Cart__c. This is the transformed name of the object that is used by the Salesforce B2B Commerce framework. All custom objects and fields that are part of the cloudcraze managed package have the prefix ccrz__ intheir API names. For example, SELECTId, Name FROM ccrz__E_Cart__c will query the CC Cart Object records. Salesforce References: B2B Commerce and D2C Commerce Developer Guide, Query Transformation