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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::commerce_consumer_procurement_v1:: ConsumerProcurementServiceClient( google::cloud::commerce_consumer_procurement_v1:: MakeConsumerProcurementServiceConnection(options)); }
[[["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 2025-04-02 UTC."],[[["This document provides version-specific documentation for overriding authentication credentials in the C++ client library for Google Cloud Commerce services, with versions ranging from 2.14.0 to 2.37.0-rc."],["The C++ client libraries typically use Application Default Credentials for authentication, but this can be overridden as shown by the example provided."],["The document details how to override the default authentication by using the `UnifiedCredentialsOption` and provides a sample code snippet of explicitly loading a service account key file."],["The provided instructions reference best practices for service account key management and also suggest referring to the \"Authentication Components\" documentation for more information on `google::cloud::Credentials` objects."],["The most recent version available is `2.37.0-rc`, and it is the top of the list, followed by a chronological list of prior releases."]]],[]]
