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Showing content from https://cloud.google.com/cpp/docs/reference/orgpolicy/latest/orgpolicy-override-authentication below:

C++ Client Libraries | Google Cloud

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How to Override the Authentication Credentials

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));
  }

Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the Best practices for managing service account keys guide for more details.

See Also

Authentication Components - for more information on the factory functions to create google::cloud::Credentials objects.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["The 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."],["Client libraries typically use Application Default Credentials for authentication with Google Cloud Services, but users can override this default if needed."],["Authentication override can be achieved by utilizing the `UnifiedCredentialsOption`, and providing a service account key file as detailed in the documentation."],["The documentation provides an example of how to load a service account key file using the `MakeServiceAccountCredentials` function."],["For more details on managing service account keys and creating `google::cloud::Credentials` objects, refer to the provided \"Best practices\" guide and the \"Authentication Components\" section respectively."]]],[]]


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