Add project files.

GoogleApi/Services/GoogleAdsClientFactory.cs

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+using Google.Ads.Gax.Config;
+using Google.Ads.GoogleAds.Config;
+using Google.Ads.GoogleAds.Lib;
+using GoogleApi.Configuration;
+using Microsoft.Extensions.Options;
+
+namespace GoogleApi.Services;
+
+// ✅ Alias the Google library config type to avoid collision with your GoogleApi.Configuration.GoogleAdsConfig
+using LibGoogleAdsConfig = Google.Ads.GoogleAds.Config.GoogleAdsConfig;
+
+public sealed class GoogleAdsClientFactory
+{
+    private readonly GoogleApi.Configuration.GoogleAdsConfig _cfg;
+    private readonly ILogger<GoogleAdsClientFactory> _logger;
+
+    public GoogleAdsClientFactory(
+        IOptions<GoogleApi.Configuration.GoogleAdsConfig> config,
+        ILogger<GoogleAdsClientFactory> logger)
+    {
+        _cfg = config.Value;
+        _logger = logger;
+    }
+
+    public bool IsRealApiEnabled =>
+        _cfg.EnableRealApi &&
+        !string.IsNullOrWhiteSpace(_cfg.DeveloperToken) &&
+        !string.IsNullOrWhiteSpace(_cfg.OAuth.ClientId) &&
+        !string.IsNullOrWhiteSpace(_cfg.OAuth.ClientSecret) &&
+        !string.IsNullOrWhiteSpace(_cfg.OAuth.RefreshToken);
+
+    public GoogleAdsClient CreateClient(GoogleAdsContext context)
+    {
+        var loginCustomerId = NormalizeCustomerId(
+            context.LoginCustomerId ?? _cfg.DefaultLoginCustomerId ?? string.Empty);
+
+        var libConfig = new LibGoogleAdsConfig
+        {
+            DeveloperToken = _cfg.DeveloperToken,
+
+            // ✅ Headless/server-to-server refresh-token flow
+            OAuth2Mode = OAuth2Flow.APPLICATION,
+            OAuth2ClientId = _cfg.OAuth.ClientId,
+            OAuth2ClientSecret = _cfg.OAuth.ClientSecret,
+            OAuth2RefreshToken = context.RefreshToken ?? _cfg.OAuth.RefreshToken,
+
+            // MCC/manager header
+            LoginCustomerId = string.IsNullOrWhiteSpace(loginCustomerId) ? null : loginCustomerId,
+
+            // ms
+            Timeout = Math.Max(1, _cfg.TimeoutSeconds) * 1000
+        };
+
+        _logger.LogDebug(
+            "[GoogleAds] CreateClient | RealApi={RealApi} LoginCustomerIdSet={LoginSet}",
+            IsRealApiEnabled,
+            !string.IsNullOrWhiteSpace(libConfig.LoginCustomerId));
+
+        return new GoogleAdsClient(libConfig);
+    }
+
+    public static string NormalizeCustomerId(string customerId)
+        => (customerId ?? string.Empty).Replace("-", string.Empty).Trim();
+
+    public static string FormatCustomerId(string customerId)
+    {
+        var normalized = NormalizeCustomerId(customerId);
+        if (normalized.Length != 10) return normalized;
+        return $"{normalized[..3]}-{normalized[3..6]}-{normalized[6..]}";
+    }
+}