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::beyondcorp_appconnections_v1::
AppConnectionsServiceClient(
google::cloud::beyondcorp_appconnections_v1::
MakeAppConnectionsServiceConnection(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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 reference information for overriding default authentication credentials when using Google Cloud client libraries.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version available is 2.37.0-rc, with a comprehensive list of previous versions from 2.36.0 down to 2.11.0 provided.\u003c/p\u003e\n"],["\u003cp\u003eThe client libraries use Application Default Credentials unless configured otherwise, but can be overridden with the UnifiedCredentialsOption.\u003c/p\u003e\n"],["\u003cp\u003eAn example demonstrates how to load a service account key file to override the default authentication and create a \u003ccode\u003eAppConnectionsServiceClient\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation also includes examples for \u003ccode\u003eAppConnectorsServiceClient\u003c/code\u003e and \u003ccode\u003eAppGatewaysServiceClient\u003c/code\u003e, as well as a link to the \u003ccode\u003eAuthentication Components\u003c/code\u003e page.\u003c/p\u003e\n"]]],[],null,[]]
