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::talent_v4::CompanyServiceClient(
google::cloud::talent_v4::MakeCompanyServiceConnection(options));
}
Follow these links to find examples for other *Client classes:
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThis document provides guidance on overriding default authentication credentials when interacting with Google Cloud Services, using the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version available is \u003ccode\u003e2.37.0-rc\u003c/code\u003e, with a list of other versions ranging from \u003ccode\u003e2.36.0\u003c/code\u003e down to \u003ccode\u003e2.11.0\u003c/code\u003e, each linking to their respective documentation.\u003c/p\u003e\n"],["\u003cp\u003eService account key files can be used to override the default credentials by utilizing the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, as demonstrated in the provided code example.\u003c/p\u003e\n"],["\u003cp\u003eExamples are available for several \u003ccode\u003e*Client\u003c/code\u003e classes including \u003ccode\u003etalent_v4::CompanyServiceClient\u003c/code\u003e, \u003ccode\u003etalent_v4::CompletionClient\u003c/code\u003e, \u003ccode\u003etalent_v4::EventServiceClient\u003c/code\u003e, \u003ccode\u003etalent_v4::JobServiceClient\u003c/code\u003e, and \u003ccode\u003etalent_v4::TenantServiceClient\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eFor best practices on managing service account keys, and more information on \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e, users can consult the links provided in the document.\u003c/p\u003e\n"]]],[],null,[]]
