code: public static AssignedAddOnExtensionFetcher fetcher(final String pathAccountSid, 
                                                          final String pathResourceSid, 
                                                          final String pathAssignedAddOnSid, 
                                                          final String pathSid) {
          return new AssignedAddOnExtensionFetcher(pathAccountSid, pathResourceSid, pathAssignedAddOnSid, pathSid);
      }
docs: Create a AssignedAddOnExtensionFetcher to execute fetch.
  
  @param pathAccountSid The SID of the Account that created the resource to
  fetch
  @param pathResourceSid The SID of the Phone Number to which the Add-on is
  assigned
  @param pathAssignedAddOnSid The SID that uniquely identifies the assigned
  Add-on installation
  @param pathSid The unique string that identifies the resource
  @return AssignedAddOnExtensionFetcher capable of executing the fetch