diff --git a/OSI-API/Controllers/ClientsController.cs b/OSI-API/Controllers/ClientsController.cs
new file mode 100644
index 0000000..e2a30f1
--- /dev/null
+++ b/OSI-API/Controllers/ClientsController.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace OSI.API.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class ClientsController : ControllerBase
+    {
+        // GET: api/Clients
+        [HttpGet]
+        public IEnumerable<string> Get()
+        {
+            return new string[] { "value1", "value2" };
+        }
+
+        // GET: api/Clients/5
+        [HttpGet("{id}", Name = "Get")]
+        public string Get(int id)
+        {
+            return "value";
+        }
+
+        // POST: api/Clients
+        [HttpPost]
+        public void Post([FromBody] string value)
+        {
+        }
+
+        // PUT: api/Clients/5
+        [HttpPut("{id}")]
+        public void Put(int id, [FromBody] string value)
+        {
+        }
+
+        // DELETE: api/Clients/5
+        [HttpDelete("{id}")]
+        public void Delete(int id)
+        {
+        }
+    }
+}
diff --git a/OSI-API/Controllers/ExpensesController.cs b/OSI-API/Controllers/ExpensesController.cs
new file mode 100644
index 0000000..82e6819
--- /dev/null
+++ b/OSI-API/Controllers/ExpensesController.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace OSI.API.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class ExpensesController : ControllerBase
+    {
+        // GET: api/Expenses
+        [HttpGet]
+        public IEnumerable<string> Get()
+        {
+            return new string[] { "value1", "value2" };
+        }
+
+        // GET: api/Expenses/5
+        [HttpGet("{id}", Name = "Get")]
+        public string Get(int id)
+        {
+            return "value";
+        }
+
+        // POST: api/Expenses
+        [HttpPost]
+        public void Post([FromBody] string value)
+        {
+        }
+
+        // PUT: api/Expenses/5
+        [HttpPut("{id}")]
+        public void Put(int id, [FromBody] string value)
+        {
+        }
+
+        // DELETE: api/Expenses/5
+        [HttpDelete("{id}")]
+        public void Delete(int id)
+        {
+        }
+    }
+}
diff --git a/OSI-API/Controllers/InvoicesController.cs b/OSI-API/Controllers/InvoicesController.cs
new file mode 100644
index 0000000..6aa8174
--- /dev/null
+++ b/OSI-API/Controllers/InvoicesController.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace OSI.API.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class InvoicesController : ControllerBase
+    {
+        // GET: api/Invoices
+        [HttpGet]
+        public IEnumerable<string> Get()
+        {
+            return new string[] { "value1", "value2" };
+        }
+
+        // GET: api/Invoices/5
+        [HttpGet("{id}", Name = "Get")]
+        public string Get(int id)
+        {
+            return "value";
+        }
+
+        // POST: api/Invoices
+        [HttpPost]
+        public void Post([FromBody] string value)
+        {
+        }
+
+        // PUT: api/Invoices/5
+        [HttpPut("{id}")]
+        public void Put(int id, [FromBody] string value)
+        {
+        }
+
+        // DELETE: api/Invoices/5
+        [HttpDelete("{id}")]
+        public void Delete(int id)
+        {
+        }
+    }
+}
diff --git a/OSI-API/Controllers/POsController.cs b/OSI-API/Controllers/POsController.cs
new file mode 100644
index 0000000..516e10c
--- /dev/null
+++ b/OSI-API/Controllers/POsController.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace OSI.API.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class POsController : ControllerBase
+    {
+        // GET: api/POs
+        [HttpGet]
+        public IEnumerable<string> Get()
+        {
+            return new string[] { "value1", "value2" };
+        }
+
+        // GET: api/POs/5
+        [HttpGet("{id}", Name = "Get")]
+        public string Get(int id)
+        {
+            return "value";
+        }
+
+        // POST: api/POs
+        [HttpPost]
+        public void Post([FromBody] string value)
+        {
+        }
+
+        // PUT: api/POs/5
+        [HttpPut("{id}")]
+        public void Put(int id, [FromBody] string value)
+        {
+        }
+
+        // DELETE: api/POs/5
+        [HttpDelete("{id}")]
+        public void Delete(int id)
+        {
+        }
+    }
+}
diff --git a/OSI-API/Controllers/PaymentsController.cs b/OSI-API/Controllers/PaymentsController.cs
new file mode 100644
index 0000000..f3cdae5
--- /dev/null
+++ b/OSI-API/Controllers/PaymentsController.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace OSI.API.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class PaymentsController : ControllerBase
+    {
+        // GET: api/Payments
+        [HttpGet]
+        public IEnumerable<string> Get()
+        {
+            return new string[] { "value1", "value2" };
+        }
+
+        // GET: api/Payments/5
+        [HttpGet("{id}", Name = "Get")]
+        public string Get(int id)
+        {
+            return "value";
+        }
+
+        // POST: api/Payments
+        [HttpPost]
+        public void Post([FromBody] string value)
+        {
+        }
+
+        // PUT: api/Payments/5
+        [HttpPut("{id}")]
+        public void Put(int id, [FromBody] string value)
+        {
+        }
+
+        // DELETE: api/Payments/5
+        [HttpDelete("{id}")]
+        public void Delete(int id)
+        {
+        }
+    }
+}
diff --git a/OSI-API/Controllers/ReportsController.cs b/OSI-API/Controllers/ReportsController.cs
new file mode 100644
index 0000000..02c2c62
--- /dev/null
+++ b/OSI-API/Controllers/ReportsController.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace OSI.API.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class ReportsController : ControllerBase
+    {
+        // GET: api/Reports
+        [HttpGet]
+        public IEnumerable<string> Get()
+        {
+            return new string[] { "value1", "value2" };
+        }
+
+        // GET: api/Reports/5
+        [HttpGet("{id}", Name = "Get")]
+        public string Get(int id)
+        {
+            return "value";
+        }
+
+        // POST: api/Reports
+        [HttpPost]
+        public void Post([FromBody] string value)
+        {
+        }
+
+        // PUT: api/Reports/5
+        [HttpPut("{id}")]
+        public void Put(int id, [FromBody] string value)
+        {
+        }
+
+        // DELETE: api/Reports/5
+        [HttpDelete("{id}")]
+        public void Delete(int id)
+        {
+        }
+    }
+}
diff --git a/OSI-API/Controllers/UsersController.cs b/OSI-API/Controllers/UsersController.cs
new file mode 100644
index 0000000..51fb69b
--- /dev/null
+++ b/OSI-API/Controllers/UsersController.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace OSI.API.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class UsersController : ControllerBase
+    {
+        // GET: api/Users
+        [HttpGet]
+        public IEnumerable<string> Get()
+        {
+            return new string[] { "value1", "value2" };
+        }
+
+        // GET: api/Users/5
+        [HttpGet("{id}", Name = "Get")]
+        public string Get(int id)
+        {
+            return "value";
+        }
+
+        // POST: api/Users
+        [HttpPost]
+        public void Post([FromBody] string value)
+        {
+        }
+
+        // PUT: api/Users/5
+        [HttpPut("{id}")]
+        public void Put(int id, [FromBody] string value)
+        {
+        }
+
+        // DELETE: api/Users/5
+        [HttpDelete("{id}")]
+        public void Delete(int id)
+        {
+        }
+    }
+}
diff --git a/OSI-API/Controllers/WeatherForecastController.cs b/OSI-API/Controllers/WeatherForecastController.cs
deleted file mode 100644
index a1b1550..0000000
--- a/OSI-API/Controllers/WeatherForecastController.cs
+++ /dev/null
@@ -1,39 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Mvc;
-using Microsoft.Extensions.Logging;
-
-namespace OSI_API.Controllers
-{
-    [ApiController]
-    [Route("[controller]")]
-    public class WeatherForecastController : ControllerBase
-    {
-        private static readonly string[] Summaries = new[]
-        {
-            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
-        };
-
-        private readonly ILogger<WeatherForecastController> _logger;
-
-        public WeatherForecastController(ILogger<WeatherForecastController> logger)
-        {
-            _logger = logger;
-        }
-
-        [HttpGet]
-        public IEnumerable<WeatherForecast> Get()
-        {
-            var rng = new Random();
-            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
-            {
-                Date = DateTime.Now.AddDays(index),
-                TemperatureC = rng.Next(-20, 55),
-                Summary = Summaries[rng.Next(Summaries.Length)]
-            })
-            .ToArray();
-        }
-    }
-}
diff --git a/OSI-API/OSI-API.csproj b/OSI-API/OSI-API.csproj
index 526e3d1..3d0c0e1 100644
--- a/OSI-API/OSI-API.csproj
+++ b/OSI-API/OSI-API.csproj
@@ -6,6 +6,8 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Versioning" Version="5.0.0" />
+    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="5.0.2" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="5.6.3" />
   </ItemGroup>
 
diff --git a/OSI-API/Startup.cs b/OSI-API/Startup.cs
index d5f3e7a..e898e20 100644
--- a/OSI-API/Startup.cs
+++ b/OSI-API/Startup.cs
@@ -32,6 +32,13 @@ namespace OSI_API
             {
                 c.SwaggerDoc("v1", new OpenApiInfo { Title = "OSI_API", Version = "v1" });
             });
+
+            services.AddApiVersioning(options =>
+            {
+                options.ReportApiVersions = true;
+                options.AssumeDefaultVersionWhenUnspecified = true;
+                options.DefaultApiVersion = new ApiVersion(1, 0);
+            });
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
@@ -41,7 +48,12 @@ namespace OSI_API
             {
                 app.UseDeveloperExceptionPage();
                 app.UseSwagger();
-                app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "OSI_API v1"));
+                // app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "OSI_API v1"));
+                app.UseSwaggerUI(c =>
+                {
+                    c.SwaggerEndpoint("/swagger/v1/swagger.json", "Delta.Net.Core.API v1");
+                    c.RoutePrefix = "api";
+                });
             }
 
             app.UseHttpsRedirection();
@@ -52,8 +64,10 @@ namespace OSI_API
 
             app.UseEndpoints(endpoints =>
             {
+                endpoints.MapControllerRoute(name: "default", pattern: "api/v{version:apiVersion}/{controller}/{action}/{id?}", null);
                 endpoints.MapControllers();
             });
+
         }
     }
 }
diff --git a/OSI-API/WeatherForecast.cs b/OSI-API/WeatherForecast.cs
deleted file mode 100644
index fe7a93d..0000000
--- a/OSI-API/WeatherForecast.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-using System;
-
-namespace OSI_API
-{
-    public class WeatherForecast
-    {
-        public DateTime Date { get; set; }
-
-        public int TemperatureC { get; set; }
-
-        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
-
-        public string Summary { get; set; }
-    }
-}