code: public OvhPcsFile serviceName_phonebooks_bookKey_export_GET(String serviceName, String bookKey, OvhContactsExportFormatsEnum format) throws IOException {
  		String qPath = "/sms/{serviceName}/phonebooks/{bookKey}/export";
  		StringBuilder sb = path(qPath, serviceName, bookKey);
  		query(sb, "format", format);
  		String resp = exec(qPath, "GET", sb.toString(), null);
  		return convertTo(resp, OvhPcsFile.class);
  	}
docs: Export the phonebook's contacts
  
  REST: GET /sms/{serviceName}/phonebooks/{bookKey}/export
  @param format [required] Format of the file
  @param serviceName [required] The internal name of your SMS offer
  @param bookKey [required] Identifier of the phonebook