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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-09 UTC."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud client libraries, specifically focusing on BeyondCorp services."],["The latest release candidate version available is 2.37.0-rc, and multiple prior versions are documented, ranging down to version 2.11.0."],["The `UnifiedCredentialsOption` is used to override the default Application Default Credentials (ADC), as demonstrated in the example using a service account key file."],["Examples of how to override credentials are provided for various BeyondCorp service clients, including `AppConnectionsServiceClient`, `AppConnectorsServiceClient`, `AppGatewaysServiceClient`, `ClientConnectorServicesServiceClient`, and `ClientGatewaysServiceClient`."],["It's suggested that for detailed information on credential management practices, one should review the guide on best practices for managing service account keys, and for more on how to create credential objects, see the Authentication Components documentation."]]],[]]