Add project files.

Gateway/Models/CampaignDto.cs

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+namespace Gateway.Models;
+
+public class CampaignDto
+{
+    public string Network { get; set; } = "";
+    public string ExternalAccountId { get; set; } = "";
+    public string CampaignId { get; set; } = "";
+    public string Name { get; set; } = "";
+    public string Status { get; set; } = "";
+    public string ChannelType { get; set; } = "";
+}

Gateway/Models/CreateCampaignRequest.cs

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+namespace Gateway.Models;
+
+public class CreateCampaignRequest
+{
+    // Campaign name
+    public string Name { get; set; } = "";
+
+    // For Google: budget uses micros (1,000,000 micros = 1 currency unit)
+    // e.g. $50/day => 50_000_000 micros
+    public long DailyBudgetMicros { get; set; }
+
+    // Optional: for future (Search/Display/PMax)
+    public string ChannelType { get; set; } = "Search";
+
+    // Optional: where your UI can store draft settings
+    public Dictionary<string, string>? Meta { get; set; }
+}

Gateway/Models/CreateCampaignResult.cs

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+namespace Gateway.Models;
+
+public class CreateCampaignResult
+{
+    public string Network { get; set; } = "";
+    public string ExternalAccountId { get; set; } = "";
+    public bool Ok { get; set; }
+    public string? CampaignId { get; set; }
+    public string? Error { get; set; }
+}

Gateway/Models/ExecutionRequest.cs

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+using System.Text.Json;
+
+namespace Gateway.Models
+{
+    public sealed class ExecutionRequest
+    {
+        /// <summary>Ad platform provider: google, meta, msads, etc.</summary>
+        public string Provider { get; set; } = "google";
+
+        /// <summary>Sub-module/microservice: system, campaigns, reporting, accounts, etc.</summary>
+        public string Service { get; set; } = "system";
+
+        /// <summary>Specific operation/action: ping, create, list, get, update, delete, etc.</summary>
+        public string Action { get; set; } = "ping";
+
+        /// <summary>Tenant/Customer ID for account context</summary>
+        public string? TenantId { get; set; }
+
+        /// <summary>Raw JSON payload for the operation</summary>
+        public JsonElement Payload { get; set; }
+    }
+}

Gateway/Models/ExecutionResponse.cs

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+namespace Gateway.Models;
+
+public sealed class ExecutionResponse
+{
+    public bool Ok { get; set; }
+    public int? LogId { get; set; }
+    public string Provider { get; set; } = "";
+    public string Service { get; set; } = "";
+    public string RequestId { get; set; } = "";
+    public int ProviderStatus { get; set; }
+    public long ElapsedMs { get; set; }
+    public object? Result { get; set; }
+    public object? Error { get; set; }
+}

Gateway/Models/ProviderRequest.cs

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+namespace Gateway.Models;
+
+public sealed class ProviderRequest
+{
+    public string Operation { get; set; } = string.Empty;
+    public string? TenantId { get; set; }
+    public string? RequestId { get; set; }
+    public Dictionary<string, object>? Payload { get; set; }
+}

Gateway/Models/ProviderResponse.cs

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+namespace Gateway.Models;
+
+public sealed class ProviderResponse
+{
+    public bool Ok { get; set; }
+    public string? RequestId { get; set; }
+    public object? Data { get; set; }
+    public ProviderError? Error { get; set; }
+}
+
+public sealed class ProviderError
+{
+    public string Code { get; set; } = "ERROR";
+    public string Message { get; set; } = "Unknown error";
+    public object? Detail { get; set; }
+}