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::telcoautomation_v1::TelcoAutomationClient(
google::cloud::telcoautomation_v1::MakeTelcoAutomationConnection(
options));
}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis page provides documentation for overriding default authentication credentials when using Google Cloud client libraries, specifically within the context of Telco Automation.\u003c/p\u003e\n"],["\u003cp\u003eThe latest release version available is 2.37.0-rc, but multiple previous versions from 2.20.0 to 2.36.0 are also available and listed.\u003c/p\u003e\n"],["\u003cp\u003eOverriding the default authentication is possible using \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, which allows for loading credentials from a service account key file, as demonstrated in the provided example.\u003c/p\u003e\n"],["\u003cp\u003eThe example demonstrates how to load service account credentials from a key file and use them to create a \u003ccode\u003eTelcoAutomationClient\u003c/code\u003e for interacting with Telco Automation services.\u003c/p\u003e\n"],["\u003cp\u003eUsers should follow best practices for managing service account keys, and can refer to the Authentication Components documentation for more information.\u003c/p\u003e\n"]]],[],null,[]]
