diff --git a/Assemblies/BitPay.Net.Lib/net452/BitPay.dll b/Assemblies/BitPay.Net.Lib/net452/BitPay.dll
index 252c4ed..82a0c52 100644
Binary files a/Assemblies/BitPay.Net.Lib/net452/BitPay.dll and b/Assemblies/BitPay.Net.Lib/net452/BitPay.dll differ
diff --git a/Assemblies/BitPay.Net.Lib/net46/BitPay.dll b/Assemblies/BitPay.Net.Lib/net46/BitPay.dll
index 173750f..6f54de8 100644
Binary files a/Assemblies/BitPay.Net.Lib/net46/BitPay.dll and b/Assemblies/BitPay.Net.Lib/net46/BitPay.dll differ
diff --git a/Assemblies/BitPay.Net.Lib/net461/BitPay.dll b/Assemblies/BitPay.Net.Lib/net461/BitPay.dll
index d67a188..e637d3b 100644
Binary files a/Assemblies/BitPay.Net.Lib/net461/BitPay.dll and b/Assemblies/BitPay.Net.Lib/net461/BitPay.dll differ
diff --git a/Assemblies/BitPay.Net.Lib/net462/BitPay.dll b/Assemblies/BitPay.Net.Lib/net462/BitPay.dll
index 41282a5..10d46ce 100644
Binary files a/Assemblies/BitPay.Net.Lib/net462/BitPay.dll and b/Assemblies/BitPay.Net.Lib/net462/BitPay.dll differ
diff --git a/Assemblies/BitPay.Net.Lib/net47/BitPay.dll b/Assemblies/BitPay.Net.Lib/net47/BitPay.dll
index 419ea8a..2fa4fd4 100644
Binary files a/Assemblies/BitPay.Net.Lib/net47/BitPay.dll and b/Assemblies/BitPay.Net.Lib/net47/BitPay.dll differ
diff --git a/Assemblies/BitPay.Net.Lib/net471/BitPay.dll b/Assemblies/BitPay.Net.Lib/net471/BitPay.dll
index 1797813..a6d7c48 100644
Binary files a/Assemblies/BitPay.Net.Lib/net471/BitPay.dll and b/Assemblies/BitPay.Net.Lib/net471/BitPay.dll differ
diff --git a/Assemblies/BitPay.Net.Lib/net472/BitPay.dll b/Assemblies/BitPay.Net.Lib/net472/BitPay.dll
index b182bf4..632698b 100644
Binary files a/Assemblies/BitPay.Net.Lib/net472/BitPay.dll and b/Assemblies/BitPay.Net.Lib/net472/BitPay.dll differ
diff --git a/Assemblies/BitPay.Net.Lib/netcoreapp2.0/BitPay.deps.json b/Assemblies/BitPay.Net.Lib/netcoreapp2.0/BitPay.deps.json
index 431a259..01db3b7 100644
--- a/Assemblies/BitPay.Net.Lib/netcoreapp2.0/BitPay.deps.json
+++ b/Assemblies/BitPay.Net.Lib/netcoreapp2.0/BitPay.deps.json
@@ -6,7 +6,7 @@
   "compilationOptions": {},
   "targets": {
     ".NETCoreApp,Version=v2.0": {
-      "BitPay/4.0.2104": {
+      "BitPay/4.1.2111": {
         "dependencies": {
           "BouncyCastle": "1.8.9",
           "Microsoft.CSharp": "4.7.0",
@@ -147,7 +147,7 @@
     }
   },
   "libraries": {
-    "BitPay/4.0.2104": {
+    "BitPay/4.1.2111": {
       "type": "project",
       "serviceable": false,
       "sha512": ""
diff --git a/Assemblies/BitPay.Net.Lib/netcoreapp2.0/BitPay.dll b/Assemblies/BitPay.Net.Lib/netcoreapp2.0/BitPay.dll
index 26f0165..8cb3775 100644
Binary files a/Assemblies/BitPay.Net.Lib/netcoreapp2.0/BitPay.dll and b/Assemblies/BitPay.Net.Lib/netcoreapp2.0/BitPay.dll differ
diff --git a/Assemblies/BitPay.Net.Lib/netcoreapp2.1/BitPay.deps.json b/Assemblies/BitPay.Net.Lib/netcoreapp2.1/BitPay.deps.json
index 909aab1..ac42496 100644
--- a/Assemblies/BitPay.Net.Lib/netcoreapp2.1/BitPay.deps.json
+++ b/Assemblies/BitPay.Net.Lib/netcoreapp2.1/BitPay.deps.json
@@ -6,7 +6,7 @@
   "compilationOptions": {},
   "targets": {
     ".NETCoreApp,Version=v2.1": {
-      "BitPay/4.0.2104": {
+      "BitPay/4.1.2111": {
         "dependencies": {
           "BouncyCastle": "1.8.9",
           "Microsoft.CSharp": "4.7.0",
@@ -137,7 +137,7 @@
     }
   },
   "libraries": {
-    "BitPay/4.0.2104": {
+    "BitPay/4.1.2111": {
       "type": "project",
       "serviceable": false,
       "sha512": ""
diff --git a/Assemblies/BitPay.Net.Lib/netcoreapp2.1/BitPay.dll b/Assemblies/BitPay.Net.Lib/netcoreapp2.1/BitPay.dll
index 95b0382..89a056b 100644
Binary files a/Assemblies/BitPay.Net.Lib/netcoreapp2.1/BitPay.dll and b/Assemblies/BitPay.Net.Lib/netcoreapp2.1/BitPay.dll differ
diff --git a/Assemblies/BitPay.Net.Lib/netcoreapp2.2/BitPay.deps.json b/Assemblies/BitPay.Net.Lib/netcoreapp2.2/BitPay.deps.json
index 97dd7cf..cafdbd3 100644
--- a/Assemblies/BitPay.Net.Lib/netcoreapp2.2/BitPay.deps.json
+++ b/Assemblies/BitPay.Net.Lib/netcoreapp2.2/BitPay.deps.json
@@ -6,7 +6,7 @@
   "compilationOptions": {},
   "targets": {
     ".NETCoreApp,Version=v2.2": {
-      "BitPay/4.0.2104": {
+      "BitPay/4.1.2111": {
         "dependencies": {
           "BouncyCastle": "1.8.9",
           "Microsoft.CSharp": "4.7.0",
@@ -137,7 +137,7 @@
     }
   },
   "libraries": {
-    "BitPay/4.0.2104": {
+    "BitPay/4.1.2111": {
       "type": "project",
       "serviceable": false,
       "sha512": ""
diff --git a/Assemblies/BitPay.Net.Lib/netcoreapp2.2/BitPay.dll b/Assemblies/BitPay.Net.Lib/netcoreapp2.2/BitPay.dll
index 77d0f1d..cfeb832 100644
Binary files a/Assemblies/BitPay.Net.Lib/netcoreapp2.2/BitPay.dll and b/Assemblies/BitPay.Net.Lib/netcoreapp2.2/BitPay.dll differ
diff --git a/Assemblies/BitPay.Net.Lib/netstandard2.0/BitPay.deps.json b/Assemblies/BitPay.Net.Lib/netstandard2.0/BitPay.deps.json
index c79af50..c3d4094 100644
--- a/Assemblies/BitPay.Net.Lib/netstandard2.0/BitPay.deps.json
+++ b/Assemblies/BitPay.Net.Lib/netstandard2.0/BitPay.deps.json
@@ -7,7 +7,7 @@
   "targets": {
     ".NETStandard,Version=v2.0": {},
     ".NETStandard,Version=v2.0/": {
-      "BitPay/4.0.2104": {
+      "BitPay/4.1.2111": {
         "dependencies": {
           "BouncyCastle": "1.8.9",
           "Microsoft.CSharp": "4.7.0",
@@ -180,7 +180,7 @@
     }
   },
   "libraries": {
-    "BitPay/4.0.2104": {
+    "BitPay/4.1.2111": {
       "type": "project",
       "serviceable": false,
       "sha512": ""
diff --git a/Assemblies/BitPay.Net.Lib/netstandard2.0/BitPay.dll b/Assemblies/BitPay.Net.Lib/netstandard2.0/BitPay.dll
index 4e7384a..1387197 100644
Binary files a/Assemblies/BitPay.Net.Lib/netstandard2.0/BitPay.dll and b/Assemblies/BitPay.Net.Lib/netstandard2.0/BitPay.dll differ
diff --git a/Assemblies/BitPay.Net.Lib_4.1.2111.zip b/Assemblies/BitPay.Net.Lib_4.1.2111.zip
new file mode 100644
index 0000000..486f813
Binary files /dev/null and b/Assemblies/BitPay.Net.Lib_4.1.2111.zip differ
diff --git a/BitPay/BitPay.cs b/BitPay/BitPay.cs
index d7f12d3..e083731 100644
--- a/BitPay/BitPay.cs
+++ b/BitPay/BitPay.cs
@@ -21,8 +21,8 @@
 
 /**
  * @author Antonio Buedo
- * @date 19.04.2021
- * @version 4.0.2104
+ * @date 08.11.2021
+ * @version 4.1.2111
  *
  * See bitpay.com/api for more information.
  */
diff --git a/BitPay/BitPay.csproj b/BitPay/BitPay.csproj
index 7127aff..45dbd87 100644
--- a/BitPay/BitPay.csproj
+++ b/BitPay/BitPay.csproj
@@ -5,10 +5,10 @@
     <TargetFrameworks>net452;net46;net461;net462;net47;net471;net472;netstandard2.0;netcoreapp2.0;netcoreapp2.1;netcoreapp2.2</TargetFrameworks>
     <LangVersion>latest</LangVersion>
     <!-- version numbers will be updated by build -->
-    <AssemblyVersion>4.0.2104.0</AssemblyVersion>
-    <FileVersion>4.0.2104</FileVersion>
-    <VersionPrefix>4.0.2104</VersionPrefix>
-    <Version>4.0.2104</Version>
+    <AssemblyVersion>4.1.2111.0</AssemblyVersion>
+    <FileVersion>4.1.2111</FileVersion>
+    <VersionPrefix>4.1.2111</VersionPrefix>
+    <Version>4.1.2111</Version>
     <Authors>Antonio Buedo</Authors>
     <Company>BitPay Inc.</Company>
     <Owners>BitPay, Inc.</Owners>
diff --git a/BitPay/Env.cs b/BitPay/Env.cs
index ee8e28b..e9024ef 100644
--- a/BitPay/Env.cs
+++ b/BitPay/Env.cs
@@ -7,9 +7,9 @@ public class Env
         public const string TestUrl = "https://test.bitpay.com/";
         public const string ProdUrl = "https://bitpay.com/";
         public const string BitpayApiVersion = "2.0.0";
-        public const string BitpayPluginInfo = "BitPay_DotNet_Client_v4.0.2104";
-        public const string BitpayApiFrame = "custom";
-        public const string BitpayApiFrameVersion = "2.0.0";
+        public const string BitpayPluginInfo = "BitPay_DotNet_Client_v4.1.2111";
+        public const string BitpayApiFrame = "std";
+        public const string BitpayApiFrameVersion = "1.0.0";
         public class Tokens
         {
             public string Merchant { get; set; }
diff --git a/BitPay/Models/Invoice/Invoice.cs b/BitPay/Models/Invoice/Invoice.cs
index 326568d..79f2ee4 100644
--- a/BitPay/Models/Invoice/Invoice.cs
+++ b/BitPay/Models/Invoice/Invoice.cs
@@ -155,7 +155,7 @@ public dynamic RefundAddresses
 
         public string BillId { get; set; }
 
-        public RefundInfo RefundInfo { get; set; }
+        public List<RefundInfo> RefundInfo { get; set; }
 
         public double AmountPaid { get; set; }