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Showing content from https://cloud.google.com/cpp/docs/reference/support/2.26.0/support-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::support_v2::CaseAttachmentServiceClient(
        google::cloud::support_v2::MakeCaseAttachmentServiceConnection(
            options));
  }

Follow these links to find examples for other *Client classes:

• support_v2::CaseAttachmentServiceClient
• support_v2::CaseServiceClient
• support_v2::CommentServiceClient

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."],[[["This page provides documentation for overriding default authentication credentials in C++ client libraries when interacting with Google Cloud Services."],["The latest version documented is 2.37.0-rc, with a list of versions dating back to 2.11.0, all linking to specific authentication override documentation."],["You can override the default credentials by using the `UnifiedCredentialsOption` to load a service account key file, as shown in the provided example."],["Examples are available for `support_v2::CaseAttachmentServiceClient`, `support_v2::CaseServiceClient`, and `support_v2::CommentServiceClient`, demonstrating how to apply service account authentication."],["The documentation also directs users to best practices for managing service account keys and provides links for more information on authentication components."]]],[]]

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