Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:
[](std::string const& keyfile) {
auto is = std::ifstream(keyfile);
is.exceptions(std::ios::badbit); // Minimal error handling in examples
auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
auto options =
google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
google::cloud::MakeServiceAccountCredentials(contents));
return google::cloud::commerce_consumer_procurement_v1::
ConsumerProcurementServiceClient(
google::cloud::commerce_consumer_procurement_v1::
MakeConsumerProcurementServiceConnection(options));
}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-04-23 UTC."],[[["This document provides a reference for the C++ Commerce API, showcasing multiple versions from 2.14.0 up to the latest release candidate 2.37.0-rc."],["The primary topic of this page is how to override the default authentication credentials used by the C++ client libraries when interacting with Google Cloud services."],["Users can override authentication by using the `UnifiedCredentialsOption` and providing a service account key file, as demonstrated in the provided code example."],["The document recommends consulting the \"Best practices for managing service account keys\" guide for in-depth information on managing service account credentials."],["Further details on creating `google::cloud::Credentials` objects can be found in the linked \"Authentication Components\" documentation."]]],[]]
