beginTransaction method
Starts a new transaction.
Throws a http.ClientException if there were problems communicating with
the API service. Throws a ServiceException if the API method failed for
any reason.
Implementation
Future<BeginTransactionResponse> beginTransaction(
BeginTransactionRequest request,
) async {
final url = _endPoint.replace(
path: '/v1/${request.database}/documents:beginTransaction',
);
final response = await _client.post(url, body: request);
return BeginTransactionResponse.fromJson(response);
}