Made progress on implementing some shops.

Performed some folder restructuring as well.

Props-Modules/Props.Shop/Ebay/Actions/SearchRequest.cs

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+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using Props.Shop.Framework;
+
+namespace Props.Shop.Ebay.Actions
+{
+    public class SearchRequest : IAsyncEnumerable<ProductListing>
+    {
+        private HttpClient http;
+        private string[] query;
+        public SearchRequest(HttpClient http, string[] query)
+        {
+            this.http = http ?? throw new ArgumentNullException("http");
+            this.query = query ?? throw new ArgumentNullException("query");
+        }
+
+        public IAsyncEnumerator<ProductListing> GetAsyncEnumerator(CancellationToken cancellationToken = default)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public class Enumerator : IAsyncEnumerator<ProductListing>
+        {
+            private HttpClient http;
+            private string[] query;
+
+            public Enumerator(HttpClient http, string[] query)
+            {
+                this.http = http;
+                this.query = query;
+            }
+
+            public ProductListing Current { get; private set; }
+
+            public ValueTask<bool> MoveNextAsync()
+            {
+                // TODO: Implement this.
+                throw new System.NotImplementedException();
+            }
+            public ValueTask DisposeAsync()
+            {
+                // TODO: Implement this.
+                throw new System.NotImplementedException();
+            }
+
+        }
+    }
+}

Props-Modules/Props.Shop/Ebay/Api/ItemSummary/SearchResultParser.cs

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+using System.Collections;
+using System.Collections.Generic;
+using Newtonsoft.Json.Linq;
+using Props.Shop.Framework;
+
+namespace Props.Shop.Ebay.Api.ItemSummary
+{
+    public class SearchResultParser
+    {
+        private dynamic data;
+        public int BeginIndex => data.offset;
+        public int EndIndex => BeginIndex + data.limit;
+        public IEnumerable<ProductListing> ProductListings { get; private set; }
+
+        public SearchResultParser(string result)
+        {
+            data = JObject.Parse(result);
+
+            List<ProductListing> parsed = new List<ProductListing>();
+            foreach (dynamic itemSummary in data.itemSummaries)
+            {
+                ProductListing listing = new ProductListing();
+                // TODO: Finish parsing the data.
+                parsed.Add(listing);
+            }
+            ProductListings = parsed;
+        }
+    }
+}

Props-Modules/Props.Shop/Ebay/Api/ItemSummary/SearchUriBuilder.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Props.Shop.Ebay.Api.ItemSummary
+{
+    public class SearchUriBuilder
+    {
+        UriBuilder uriBuilder = new UriBuilder("/search");
+        private HashSet<string> queries = new HashSet<string>();
+        private bool autoCorrect = false;
+        private int? maxResults = 100;
+        private int? offset = 0;
+        public bool AutoCorrect
+        {
+            set
+            {
+                autoCorrect = value;
+            }
+        }
+
+        public int? MaxResults
+        {
+            set
+            {
+                maxResults = value;
+            }
+        }
+
+        public int? Offset
+        {
+            set
+            {
+                offset = value;
+            }
+        }
+
+        public void AddSearchQuery(string query)
+        {
+            queries.Add(query);
+        }
+
+        public Uri Build()
+        {
+            StringBuilder queryBuilder = new StringBuilder("q=");
+            queryBuilder.Append('(');
+            queryBuilder.AppendJoin(", ", queries);
+            queryBuilder.Append(')');
+            uriBuilder.Query += queryBuilder.ToString();
+
+            if (autoCorrect) uriBuilder.Query += "&auto_correct=KEYWORD";
+            if (maxResults.HasValue) uriBuilder.Query += "&limit=" + maxResults.Value;
+            if (offset.HasValue) uriBuilder.Query += "&offset=" + offset.Value;
+            return uriBuilder.Uri;
+        }
+    }
+}

Props-Modules/Props.Shop/Ebay/Configuration.cs

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+namespace Props.Shop.Ebay
+{
+    public class Configuration
+    {
+        public bool Sandbox { get; set; } = true;
+    }
+}

Props-Modules/Props.Shop/Ebay/EbayShop.cs

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+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Text;
+using System.Text.Json;
+using Props.Shop.Framework;
+
+namespace Props.Shop.Ebay
+{
+    public class EbayShop : IShop
+    {
+        private bool disposedValue;
+
+        public string ShopName => "Ebay";
+
+        public string ShopDescription => "A multi-national online store host to consumer-to-consumer and business-to-consumer sales.";
+
+        public string ShopModuleAuthor => "Reslate";
+
+        public SupportedFeatures SupportedFeatures => new SupportedFeatures(
+            true,
+            true,
+            true,
+            true,
+            true
+        );
+
+        Configuration configuration;
+
+        private HttpClient httpClient;
+
+        public IEnumerable<IOption> Initialize(byte[] data)
+        {
+            httpClient = new HttpClient();
+            configuration = JsonSerializer.Deserialize<Configuration>(data);
+            return new List<IOption>() {
+                new SandboxOption(configuration),
+            };
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (!disposedValue)
+            {
+                if (disposing)
+                {
+                    httpClient.Dispose();
+                }
+                disposedValue = true;
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+
+        public byte[] GetDataForPersistence()
+        {
+            return JsonSerializer.SerializeToUtf8Bytes(configuration);
+        }
+
+        public IAsyncEnumerable<ProductListing> Search(string query, Filters filters)
+        {
+            // TODO: Implement the search system.
+            throw new NotImplementedException();
+        }
+    }
+}

Props-Modules/Props.Shop/Ebay/Options/SandboxOption.cs

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+using System;
+using Props.Shop.Framework;
+
+namespace Props.Shop.Ebay
+{
+    public class SandboxOption : IOption
+    {
+        private Configuration configuration;
+        public string Name => "Ebay Sandbox";
+
+        public string Description => "For development purposes, Ebay Sandbox allows use of Ebay APIs (with exceptions) in a sandbox environment before applying for production use.";
+
+        public bool Required => true;
+
+        public Type Type => typeof(bool);
+
+        internal SandboxOption(Configuration configuration)
+        {
+            this.configuration = configuration;
+        }
+
+        public string GetValue()
+        {
+            return configuration.Sandbox.ToString();
+        }
+
+        public bool SetValue(string value)
+        {
+            bool sandbox = false;
+            bool res = bool.TryParse(value, out sandbox);
+            configuration.Sandbox = sandbox;
+            return res;
+        }
+    }
+}

Props-Modules/Props.Shop/Ebay/Props.Shop.Ebay.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <ItemGroup>
+    <ProjectReference Include="..\Framework\Props.Shop.Framework.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>