Add project files.

GoogleApi/Models/OperationPayloads.cs

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+using System.Text.Json.Serialization;
+
+namespace GoogleApi.Models;
+
+#region Campaign Payloads
+
+public sealed class CreateCampaignPayload
+{
+    public string Name { get; set; } = string.Empty;
+    public CampaignType Type { get; set; } = CampaignType.Search;
+    public long BudgetMicros { get; set; }
+    public BiddingStrategy BiddingStrategy { get; set; } = BiddingStrategy.MaximizeClicks;
+    public string? StartDate { get; set; }
+    public string? EndDate { get; set; }
+}
+
+public sealed class GetCampaignPayload
+{
+    public string CampaignId { get; set; } = string.Empty;
+}
+
+public sealed class UpdateCampaignPayload
+{
+    public string CampaignId { get; set; } = string.Empty;
+    public string? Name { get; set; }
+    public long? BudgetMicros { get; set; }
+    public CampaignStatus? Status { get; set; }
+}
+
+public sealed class ListCampaignsPayload
+{
+    public CampaignStatus? StatusFilter { get; set; }
+    public int PageSize { get; set; } = 50;
+    public string? PageToken { get; set; }
+}
+
+#endregion
+
+#region Reporting Payloads
+
+public sealed class CampaignStatsPayload
+{
+    public string CampaignId { get; set; } = string.Empty;
+    public string? StartDate { get; set; }
+    public string? EndDate { get; set; }
+}
+
+public sealed class AccountStatsPayload
+{
+    public string? StartDate { get; set; }
+    public string? EndDate { get; set; }
+}
+
+#endregion
+
+#region Enums
+
+[JsonConverter(typeof(JsonStringEnumConverter))]
+public enum CampaignStatus
+{
+    Unknown = 0,
+    Enabled = 1,
+    Paused = 2,
+    Removed = 3
+}
+
+[JsonConverter(typeof(JsonStringEnumConverter))]
+public enum CampaignType
+{
+    Search = 0,
+    Display = 1,
+    Shopping = 2,
+    Video = 3,
+    PerformanceMax = 4
+}
+
+[JsonConverter(typeof(JsonStringEnumConverter))]
+public enum BiddingStrategy
+{
+    ManualCpc = 0,
+    MaximizeClicks = 1,
+    MaximizeConversions = 2,
+    TargetCpa = 3,
+    TargetRoas = 4
+}
+
+#endregion