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Showing content from https://cloud.google.com/cpp/docs/reference/support/2.16.0/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 documents various versions of the C++ client library, specifically related to overriding authentication, with the latest version being 2.37.0-rc."],["The library versions range from 2.11.0 up to the latest release candidate, 2.37.0-rc, and provide documentation on how to override default authentication credentials."],["Overriding default authentication is achieved by providing the `UnifiedCredentialsOption`, allowing you to load a service account key file explicitly."],["Examples are available for `support_v2::CaseAttachmentServiceClient`, `support_v2::CaseServiceClient`, and `support_v2::CommentServiceClient`, demonstrating how to use service account keys with different client classes."],["Default authentication typically uses Application Default Credentials, and more information about authentication components, including factory functions for creating `google::cloud::Credentials` objects, can be found in the Authentication Components section."]]],[]]

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