Override Publisher Default Universe Domain

 namespace pubsub = ::google::cloud::pubsub; [](std::string const& project_id, std::string const& topic_id) { google::cloud::Options options; // AddUniverseDomainOption interrogates the UnifiedCredentialsOption, if // set, in the provided Options for the Universe Domain associated with the // credentials and adds it to the set of Options. // If no UnifiedCredentialsOption is set, GoogleDefaultCredentials are used. auto ud_options = google::cloud::AddUniverseDomainOption(std::move(options)); if (!ud_options.ok()) throw std::move(ud_options).status(); auto pub = pubsub::Publisher(pubsub::MakePublisherConnection( "europe-central2", pubsub::Topic(project_id, topic_id), *ud_options)); }