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 2025-05-07 UTC."],[[["This document provides guidance on overriding default authentication credentials when using Google Cloud client libraries, particularly for the C++ Commerce API."],["The latest version of the C++ Commerce API documentation available is 2.37.0-rc, and many previous versions are also available, going back to 2.14.0."],["You can override the default credentials by utilizing the `UnifiedCredentialsOption` and explicitly loading a service account key file, as shown in the provided example."],["The document highlights the use of `MakeServiceAccountCredentials` to load the service account key file for `UnifiedCredentialsOption` and to use `google::cloud::Options` to set it."],["Further details on managing service account keys and authentication components can be found in the \"Best practices for managing service account keys\" and \"Authentication Components\" documentation links respectively."]]],[]]
