diff --git a/.vscode/launch.json b/.vscode/launch.json
index 20569db..5d77af8 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -24,7 +24,8 @@
             },
             "sourceFileMap": {
                 "/Views": "${workspaceFolder}/Views"
-            }
+            },
+            "enableStepFiltering": false
         },
         {
             "name": ".NET Core Attach",
diff --git a/OSI-API.Business/OSI-API.Business.csproj b/OSI-API.Business/OSI-API.Business.csproj
new file mode 100644
index 0000000..0943e83
--- /dev/null
+++ b/OSI-API.Business/OSI-API.Business.csproj
@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+    <RootNamespace>OSI_API.Business</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Restsharp" Version="106.11.7" />
+    <PackageReference Include="System.Text.Json" Version="5.0.2" />
+  </ItemGroup>
+
+</Project>
diff --git a/OSI-API.Business/Objects/InvoiceRequestResponse.cs b/OSI-API.Business/Objects/InvoiceRequestResponse.cs
new file mode 100644
index 0000000..3c96618
--- /dev/null
+++ b/OSI-API.Business/Objects/InvoiceRequestResponse.cs
@@ -0,0 +1,9 @@
+namespace OSI.API.Business.Objects
+{
+    public class InvoiceObject
+    {
+        public int InvoiceNumber { get; set; }
+        public float InvoiceAmount { get; set; }
+        public float Discount { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/OSI-API/Controllers/InvoicesController.cs b/OSI-API/Controllers/InvoicesController.cs
index 4d4e46e..f6b8239 100644
--- a/OSI-API/Controllers/InvoicesController.cs
+++ b/OSI-API/Controllers/InvoicesController.cs
@@ -4,43 +4,41 @@ using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
+using OSI.API.Business.Objects;
 
 namespace OSI.API.Controllers
 {
     [Route("api/v{version:apiVersion}/[controller]")]
     [ApiController]
-    public class InvoicesController : ControllerBase
+    public class InvoicesController : EndpointBase<InvoiceObject>
     {
-        // GET: api/Invoices
-        [HttpGet]
-        public IEnumerable<string> Get()
+        public override IActionResult Delete(int id)
         {
-            return new string[] { "value1", "value2" };
+            return NotFound();
         }
 
-        // GET: api/Invoices/5
-        [HttpGet("{id}")]
-        public string Get(int id)
+        public override IActionResult Get()
         {
-            return "value";
+            throw new NotImplementedException();
         }
 
-        // POST: api/Invoices
-        [HttpPost]
-        public void Post([FromBody] string value)
+        public override IActionResult Get(int id)
         {
+            return new JsonResult(id);
         }
 
-        // PUT: api/Invoices/5
-        [HttpPut("{id}")]
-        public void Put(int id, [FromBody] string value)
+        public override IActionResult Post([FromBody] InvoiceObject input)
         {
+            throw new NotImplementedException();
         }
 
-        // DELETE: api/Invoices/5
-        [HttpDelete("{id}")]
-        public void Delete(int id)
+        public override IActionResult Put(int id, [FromBody] InvoiceObject input)
         {
+            return CreatedAtAction(
+                "Get",
+                routeValues: new { id = input.InvoiceAmount },
+                value: Get(id)
+            );
         }
     }
 }
diff --git a/OSI-API/Controllers/_EndpointBase.cs b/OSI-API/Controllers/_EndpointBase.cs
new file mode 100644
index 0000000..64d8270
--- /dev/null
+++ b/OSI-API/Controllers/_EndpointBase.cs
@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+using Microsoft.AspNetCore.Mvc;
+using System.Threading.Tasks;
+
+namespace OSI.API.Controllers
+{
+    public abstract class EndpointBase<A> : ControllerBase
+    {
+        [HttpGet]
+        public abstract IActionResult Get();
+
+        // GET: api/Clients/5
+        [HttpGet("{id}")]
+        public abstract IActionResult Get(int id);
+
+        // POST: api/Clients
+        [HttpPost]
+        public abstract IActionResult Post([FromBody] A input);
+
+        // PUT: api/Clients/5
+        [HttpPut("{id}")]
+        public abstract IActionResult Put(int id, [FromBody] A input);
+
+        // DELETE: api/Clients/5
+        [HttpDelete("{id}")]
+        public abstract IActionResult Delete(int id);
+    }
+}
\ No newline at end of file
diff --git a/OSI-API/OSI-API.csproj b/OSI-API/OSI-API.csproj
index 3d0c0e1..601b417 100644
--- a/OSI-API/OSI-API.csproj
+++ b/OSI-API/OSI-API.csproj
@@ -11,4 +11,8 @@
     <PackageReference Include="Swashbuckle.AspNetCore" Version="5.6.3" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\OSI-API.Business\OSI-API.Business.csproj" />
+  </ItemGroup>
+
 </Project>
diff --git a/OSI-API/Program.cs b/OSI-API/Program.cs
index 83c815c..a601377 100644
--- a/OSI-API/Program.cs
+++ b/OSI-API/Program.cs
@@ -7,7 +7,7 @@ using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 
-namespace OSI_API
+namespace OSI.API
 {
     public class Program
     {
diff --git a/OSI-API/Startup.cs b/OSI-API/Startup.cs
index e898e20..d122abf 100644
--- a/OSI-API/Startup.cs
+++ b/OSI-API/Startup.cs
@@ -12,7 +12,7 @@ using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using Microsoft.OpenApi.Models;
 
-namespace OSI_API
+namespace OSI.API
 {
     public class Startup
     {
@@ -56,7 +56,7 @@ namespace OSI_API
                 });
             }
 
-            app.UseHttpsRedirection();
+            // app.UseHttpsRedirection();
 
             app.UseRouting();