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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::channel_v1::CloudChannelServiceClient( google::cloud::channel_v1::MakeCloudChannelServiceConnection(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"]],[["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 2025-03-21 UTC."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud client libraries, specifically focusing on the `channel_v1` service."],["The latest version available is 2.37.0-rc, and the current page is displaying information for version 2.29.0-rc."],["Users can override the default Application Default Credentials by utilizing the `UnifiedCredentialsOption` and providing a service account key file."],["The provided code example demonstrates how to load a service account key file and create a `CloudChannelServiceClient` with the custom credentials."],["Further information on managing service account keys and authentication components can be found in the linked \"Best practices\" and \"Authentication Components\" resources, respectively."]]],[]]