billing

YavscLib/Billing/IBillItem.cs

@@ -0,0 +1,13 @@
+namespace YavscLib.Billing
+{
+    public interface IBillItem {
+        string Name { get; set; }
+        string Description { get; set; }
+        int Count { get; set; }
+        decimal UnitaryCost { get; set; }
+        string Currency { get; set; }
+
+        string Reference { get; }
+
+    }
+}

YavscLib/Billing/IBillable.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+
+namespace YavscLib.Billing
+{
+    public interface IBillable {
+        string Description { get; set; }
+        List<IBillItem> GetBillItems();
+
+    }
+}

YavscLib/Billing/IBillingImpacter.cs

@@ -0,0 +1,8 @@
+
+namespace YavscLib.Billing
+{
+    public interface IBillingImpacter { 
+        decimal Impact(decimal orgValue);
+
+    }
+}