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::orgpolicy_v2::OrgPolicyClient(
google::cloud::orgpolicy_v2::MakeOrgPolicyConnection(options));
}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThe latest version of the documentation is 2.37.0-rc, and the webpage contains links to documentation for versions ranging from 2.11.0 up to this latest release.\u003c/p\u003e\n"],["\u003cp\u003eClient libraries typically use Application Default Credentials for authentication with Google Cloud Services, but users can override this default if needed.\u003c/p\u003e\n"],["\u003cp\u003eAuthentication override can be achieved by utilizing the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, and providing a service account key file as detailed in the documentation.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation provides an example of how to load a service account key file using the \u003ccode\u003eMakeServiceAccountCredentials\u003c/code\u003e function.\u003c/p\u003e\n"],["\u003cp\u003eFor more details on managing service account keys and creating \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects, refer to the provided "Best practices" guide and the "Authentication Components" section respectively.\u003c/p\u003e\n"]]],[],null,[]]
