code: public Tabs listTabs(String accountId, String templateId, String recipientId) throws ApiException {
      return listTabs(accountId, templateId, recipientId, null);
    }
docs: Gets the tabs information for a signer or sign-in-person recipient in a template.
  Gets the tabs information for a signer or sign-in-person recipient in a template.
  @param accountId The external account number (int) or account ID Guid. (required)
  @param templateId The ID of the template being accessed. (required)
  @param recipientId The ID of the recipient being accessed. (required)
  @return Tabs