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 2025-04-23 UTC."],[[["The latest version available is 2.37.0-rc, with the provided list detailing versions down to 2.14.0 for the C++ commerce override authentication documentation."],["The client libraries primarily utilize Application Default Credentials for Google Cloud Services authentication, but this can be overridden when necessary."],["You can override the default authentication by employing the `UnifiedCredentialsOption`, as demonstrated through the example of loading a service account key file, which is explained in the document."],["The provided code snippet shows an example of loading a service account key file to override the default credentials using `google::cloud::MakeServiceAccountCredentials`."],["For in depth information regarding the best way to manage your service account keys, and more information on `google::cloud::Credentials` you can refer to the provided links."]]],[]]
