code: public com.google.api.ads.adwords.axis.v201809.rm.CustomerMatchUploadKeyType getUploadKeyType() {
          return uploadKeyType;
      }
docs: Gets the uploadKeyType value for this CrmBasedUserList.
  
  @return uploadKeyType   * Matching key type of the list.
  This field is read only and set on the first upload
  by API.
  Mixed data types are not allowed on the same list.
  From v201802, this field will be required for an ADD operation.
  <span class="constraint Selectable">This field
  can be selected using the value "UploadKeyType".</span>
  <span class="constraint ReadOnly">This field is
  read only and will be ignored when sent to the API for the following
  {@link Operator}s: SET.</span>