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src/Yavsc/Helpers/CompanyInfoHelpers.cs

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+using System.Net.Http;
+using System.Threading.Tasks;
+using Newtonsoft.Json.Linq;
+
+namespace  Yavsc.Helpers
+{
+    using Models.societe.com;
+    public static class ComapnyInfoHelpers { 
+        public static async Task<CompanyInfoMessage> CheckSiren(this HttpClient web,
+        string siren, CompanyInfoSettings api)
+        {
+            using (var request = new HttpRequestMessage(HttpMethod.Get,
+            string.Format(Constants.CompanyInfoUrl,siren,api.ApiKey))) {
+                using (var response = await web.SendAsync(request)) {
+                    var payload = JObject.Parse(await response.Content.ReadAsStringAsync());
+                    return payload.ToObject<CompanyInfoMessage>();
+                }
+            }
+        }
+    }
+}