Extract it as a method for later migration to a MVC controller

TwilioSMSReceiver/Controllers/SMSReceiverController.cs

@@ -59,6 +59,23 @@ namespace TwilioSMSReceiver.Controllers
         // To protect from overposting attacks, see https://go.microsoft.com/fwlink/?linkid=2123754
         [HttpPost]
         public async Task<ActionResult<SMSModel>> PostSMSModel([FromForm]SmsRequest smsRequest, [FromForm] int? numMedia)
+        {
+            SMSModel message = ProcessTwilioSMS(smsRequest, numMedia);
+
+            _context.SMSMessages.Add(message);
+            await _context.SaveChangesAsync();
+
+            List<Task> _HandleAllMessages = new List<Task>();
+
+            foreach (var handler in _messageHandlers)
+            {
+                _HandleAllMessages.Add(handler.RelaySms(message));
+            }
+            return Ok();
+        }
+
+        [NonAction]
+        protected SMSModel ProcessTwilioSMS(SmsRequest smsRequest, int? numMedia)
         {
             var mmsItems = new List<MMSModel>();
             var message = new SMSModel
@@ -81,16 +98,7 @@ namespace TwilioSMSReceiver.Controllers
                 message.MMSContent = mmsItems;
             }
 
-            _context.SMSMessages.Add(message);
+            return message;
-            await _context.SaveChangesAsync();
-
-            List<Task> _HandleAllMessages = new List<Task>();
-
-            foreach (var handler in _messageHandlers)
-            {
-                _HandleAllMessages.Add(handler.RelaySms(message));
-            }
-            return Ok();
         }
 
         private bool SMSModelExists(int id)