diff --git a/src/DigitalData.Swagger.MockAPI/Controllers/MockController.cs b/src/DigitalData.Swagger.MockAPI/Controllers/MockController.cs
index 8b79bca..7a1f3c6 100644
--- a/src/DigitalData.Swagger.MockAPI/Controllers/MockController.cs
+++ b/src/DigitalData.Swagger.MockAPI/Controllers/MockController.cs
@@ -6,7 +6,7 @@ namespace DigitalData.Swagger.MockAPI.Controllers
     public class MockController : ControllerBase
     {
         [HttpPost("{servicetierName}/ODataV4/{webserviceName}_CreateInvoice")]
-        public IActionResult CreateInvoice([FromRoute] string servicetierName, [FromRoute] string webserviceName, [FromQuery] string company)
+        public IActionResult CreateInvoice([FromRoute] string servicetierName, [FromRoute] string webserviceName, [FromQuery] string company, Dictionary<string, object>? body)
         {
             return Created($"{servicetierName}/ODataV4/{webserviceName}?id={1}", new { Id = 1, Foo = 1});
         }
diff --git a/src/DigitalData.Swagger.Proxy/Controllers/ProxyController.cs b/src/DigitalData.Swagger.Proxy/Controllers/ProxyController.cs
index dc3cceb..ef50575 100644
--- a/src/DigitalData.Swagger.Proxy/Controllers/ProxyController.cs
+++ b/src/DigitalData.Swagger.Proxy/Controllers/ProxyController.cs
@@ -14,7 +14,7 @@ public class ProxyController(IOptions<OriginServerParams> originServerParamsOpti
     private readonly OriginServerParams _origin = originServerParamsOptions.Value;
 
     [HttpPost("{servicetierName}/ODataV4/{webserviceName}_CreateInvoice")]
-    public async Task<IActionResult> Redir([FromRoute] string servicetierName, [FromRoute] string webserviceName, [FromQuery] string company)
+    public async Task<IActionResult> Redir([FromRoute] string servicetierName, [FromRoute] string webserviceName, [FromQuery] string company, [FromBody] Dictionary<string, object>? body = null)
     {
         var req = _origin.Url
             .AppendPathSegment(servicetierName)
@@ -22,7 +22,7 @@ public class ProxyController(IOptions<OriginServerParams> originServerParamsOpti
             .AppendPathSegment(webserviceName + "_CreateInvoice")
             .SetQueryParams(new { company })
             .WithHeader("X-Forwarded-For", HttpContext.Connection.RemoteIpAddress?.ToString());
-
+            
         // Add default headers
         foreach (var header in _origin.DefaultHeaders)
             req = req.WithHeader(header.Key, header.Value);
@@ -36,7 +36,7 @@ public class ProxyController(IOptions<OriginServerParams> originServerParamsOpti
             req = req.WithCookie(cookie.Key, cookie.Value);
 
         //post request
-        var res = await req.PostAsync();
+        var res = body is null ?  await req.PostAsync() :  await req.PostJsonAsync(body);
         
         // set headers
         foreach (var (Name, Value) in res.Headers)
@@ -46,10 +46,10 @@ public class ProxyController(IOptions<OriginServerParams> originServerParamsOpti
         foreach (var (Name, Value) in res.Cookies.ToKeyValuePairs())
             HttpContext.Response.Cookies.Append(Name, Value.ToString() ?? string.Empty);
 
-        var body = res.GetJsonAsync<dynamic>();
+        var resBody = res.GetJsonAsync<dynamic>();
 
-        if (body is not null)
-            return new JsonResult(body)
+        if (resBody is not null)
+            return new JsonResult(resBody)
             {
                 StatusCode = res.StatusCode
             };