Greenfield: Store Users (#3425)

* Greenfield: Store Users

* fixups

Co-authored-by: nicolas.dorier <nicolas.dorier@gmail.com>

BTCPayServer.Client/BTCPayServerClient.StoreUsers.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using BTCPayServer.Client.Models;
+
+namespace BTCPayServer.Client
+{
+    public partial class BTCPayServerClient
+    {
+        public virtual async Task<IEnumerable<StoreUserData>> GetStoreUsers(string storeId,
+            CancellationToken token = default)
+        {
+            using var response = await _httpClient.SendAsync(CreateHttpRequest($"api/v1/stores/{storeId}/users"), token);
+            return await HandleResponse<IEnumerable<StoreUserData>>(response);
+        }
+
+        public virtual async Task RemoveStoreUser(string storeId, string userId, CancellationToken token = default)
+        {
+            using var response = await _httpClient.SendAsync(
+                CreateHttpRequest($"api/v1/stores/{storeId}/users/{userId}", method: HttpMethod.Delete), token);
+            await HandleResponse(response);
+        }
+
+        public virtual async Task<StoreData> AddStoreUser(string storeId, StoreUserData request,
+            CancellationToken token = default)
+        {
+            if (request == null)
+                throw new ArgumentNullException(nameof(request));
+            using var response = await _httpClient.SendAsync(
+                CreateHttpRequest($"api/v1/stores/{storeId}/users", bodyPayload: request, method: HttpMethod.Post),
+                token);
+            return await HandleResponse<StoreData>(response);
+        }
+    }
+}