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

C++ Client Libraries | Google Cloud

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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::apikeys_v2::ApiKeysClient(
        google::cloud::apikeys_v2::MakeApiKeysConnection(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.

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 available is 2.37.0-rc, with several other previous versions listed, ranging down to version 2.11.0."],["Client libraries use Application Default Credentials for authentication, but this can be overridden as needed."],["You can override default authentication by utilizing `UnifiedCredentialsOption` and explicitly loading a service account key file, as demonstrated in the provided example."],["The example shown provides a simple way to load credentials, but the [Best practices for managing service account keys](https://cloud.google.com/iam/docs/best-practices-for-managing-service-account-keys) guide should be consulted for more complex implementations."],["The [Authentication Components](https://cloud.google.com/cpp/docs/reference/common/latest/group__guac.html) link gives further information on creating `google::cloud::Credentials` objects."]]],[]]

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