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::billing_budgets_v1::BudgetServiceClient(
google::cloud::billing_budgets_v1::MakeBudgetServiceConnection(
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."],[[["The latest version available is 2.37.0-rc, with multiple older versions available ranging from 2.36.0 down to 2.11.0."],["Client libraries primarily use Application Default Credentials for authentication with Google Cloud Services, but can be overridden if needed."],["Overriding the default authentication involves using the `UnifiedCredentialsOption`, demonstrated with an example of loading a service account key file."],["The example code shows how to override authentication by explicitly loading a service account key file and provides links to other client class examples such as `billing_budgets_v1::BudgetServiceClient`, `billing_v1::CloudBillingClient`, and `billing_v1::CloudCatalogClient`."],["Consult the best practices guide for more details about managing service accounts and refer to the Authentication Components for more information about credential objects."]]],[]]
