Changed folder structure, added explicit nullable for extensions.

Extensions/Cloudflare.Zones/Internals/Filters/CreateZoneHoldFilter.cs

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+using System.Collections.Generic;
+
+namespace AMWD.Net.Api.Cloudflare.Zones.Internals.Filters
+{
+	internal class CreateZoneHoldFilter : IQueryParameterFilter
+	{
+		public bool IncludeSubdomains { get; set; }
+
+		public IDictionary<string, string> GetQueryParameters()
+		{
+			var dict = new Dictionary<string, string>();
+
+			if (IncludeSubdomains)
+				dict.Add("include_subdomains", "true");
+
+			return dict;
+		}
+	}
+}

Extensions/Cloudflare.Zones/Internals/Filters/DeleteZoneHoldFilter.cs

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+using System;
+using System.Collections.Generic;
+
+namespace AMWD.Net.Api.Cloudflare.Zones.Internals.Filters
+{
+	internal class DeleteZoneHoldFilter : IQueryParameterFilter
+	{
+		public DateTime? HoldAfter { get; set; }
+
+		public IDictionary<string, string> GetQueryParameters()
+		{
+			var dict = new Dictionary<string, string>();
+
+			if (HoldAfter.HasValue)
+				dict.Add("hold_after", HoldAfter.Value.ToUniversalTime().ToString("yyyy-MM-dd'T'HH:mm:ss'Z'"));
+
+			return dict;
+		}
+	}
+}

Extensions/Cloudflare.Zones/Internals/Requests/InternalCreateZoneRequest.cs

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+namespace AMWD.Net.Api.Cloudflare.Zones.Internals.Requests
+{
+	internal class InternalCreateZoneRequest
+	{
+		public InternalCreateZoneRequest(AccountBase account, string name)
+		{
+			Account = account;
+			Name = name;
+		}
+
+		[JsonProperty("account")]
+		public AccountBase Account { get; set; }
+
+		[JsonProperty("name")]
+		public string Name { get; set; }
+
+		[JsonProperty("type")]
+		public ZoneType? Type { get; set; }
+	}
+}

Extensions/Cloudflare.Zones/Internals/Requests/InternalEditZoneRequest.cs

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+using System.Collections.Generic;
+
+namespace AMWD.Net.Api.Cloudflare.Zones.Internals.Requests
+{
+	internal class InternalEditZoneRequest
+	{
+		[JsonProperty("type")]
+		public ZoneType? Type { get; set; }
+
+		[JsonProperty("vanity_name_servers")]
+		public IList<string>? VanityNameServers { get; set; }
+	}
+}

Extensions/Cloudflare.Zones/Internals/Requests/InternalPurgeCacheRequest.cs

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+using System.Collections.Generic;
+
+namespace AMWD.Net.Api.Cloudflare.Zones.Internals.Requests
+{
+	internal class InternalPurgeCacheRequest
+	{
+		[JsonProperty("purge_everything")]
+		public bool? PurgeEverything { get; set; }
+
+		[JsonProperty("tags")]
+		public IList<string>? Tags { get; set; }
+
+		[JsonProperty("hosts")]
+		public IList<string>? Hostnames { get; set; }
+
+		[JsonProperty("prefixes")]
+		public IList<string>? Prefixes { get; set; }
+
+		[JsonProperty("files")]
+		public IList<string>? Urls { get; set; }
+
+		[JsonProperty("files")]
+		public IList<PurgeUrlWithHeaders>? UrlsWithHeaders { get; set; }
+	}
+}

Extensions/Cloudflare.Zones/Internals/Requests/InternalUpdateDnsSettingsRequest.cs

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+namespace AMWD.Net.Api.Cloudflare.Zones.Internals.Requests
+{
+	internal class InternalUpdateDnsSettingsRequest
+	{
+		[JsonProperty("flatten_all_cnames")]
+		public bool? FlattenAllCnames { get; set; }
+
+		[JsonProperty("foundation_dns")]
+		public bool? FoundationDns { get; set; }
+
+		[JsonProperty("multi_provider")]
+		public bool? MultiProvider { get; set; }
+
+		[JsonProperty("nameservers")]
+		public Nameserver? Nameservers { get; set; }
+
+		[JsonProperty("ns_ttl")]
+		public int? NameserverTtl { get; set; }
+
+		[JsonProperty("secondary_overrides")]
+		public bool? SecondaryOverrides { get; set; }
+
+		[JsonProperty("soa")]
+		public StartOfAuthority? Soa { get; set; }
+
+		[JsonProperty("zone_mode")]
+		public ZoneMode? Mode { get; set; }
+	}
+}

Extensions/Cloudflare.Zones/Internals/Requests/PurgeUrlWithHeaders.cs

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+using System.Collections.Generic;
+
+namespace AMWD.Net.Api.Cloudflare.Zones.Internals.Requests
+{
+	internal class PurgeUrlWithHeaders
+	{
+		[JsonProperty("headers")]
+		public Dictionary<string, string> Headers { get; set; } = [];
+
+		[JsonProperty("url")]
+		public string? Url { get; set; }
+	}
+}