diff --git a/EnvelopeGenerator.Domain/Interfaces/IEnvelope.cs b/EnvelopeGenerator.Domain/Interfaces/IEnvelope.cs
new file mode 100644
index 00000000..bdc709c6
--- /dev/null
+++ b/EnvelopeGenerator.Domain/Interfaces/IEnvelope.cs
@@ -0,0 +1,15 @@
+namespace EnvelopeGenerator.Domain.Interfaces
+{
+    public interface IEnvelope
+    {
+        int? EnvelopeTypeId { get; set; }
+    }
+
+    public static class EnvelopeExtensions
+    {
+        public static bool IsReadAndConfirm(this IEnvelope envelope)
+        {
+            return envelope.EnvelopeTypeId == 2;
+        }
+    }
+}
\ No newline at end of file