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."],[[["This document provides a list of available versions for the billing documentation, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The primary topic of this page is how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services, using the `UnifiedCredentialsOption`."],["An example demonstrates loading a service account key file to override default credentials, showcasing how to use the `MakeServiceAccountCredentials` function."],["Links to examples for other client classes such as `billing_budgets_v1::BudgetServiceClient`, `billing_v1::CloudBillingClient`, and `billing_v1::CloudCatalogClient` are provided for reference."],["The document directs users to additional resources, such as the guide on best practices for managing service account keys and the Authentication Components page for more information on `google::cloud::Credentials` objects."]]],[]]
