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::advisorynotifications_v1::
AdvisoryNotificationsServiceClient(
google::cloud::advisorynotifications_v1::
MakeAdvisoryNotificationsServiceConnection(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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThis page provides documentation for various versions of the Advisory Notifications service, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe content demonstrates how to override the default authentication credentials using \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e by explicitly loading a service account key file, as an example for a relatively easy to understand case.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation recommends consulting the "Best practices for managing service account keys" guide for more comprehensive details on key management.\u003c/p\u003e\n"],["\u003cp\u003eThe default authentication method used by the client libraries is the Application Default Credentials, unless you change it with \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eYou can find additional information on the factory functions for creating \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects in the Authentication Components section.\u003c/p\u003e\n"]]],[],null,[]]
