Index: ChapterX.API/Controllers/ChaptersController.cs
===================================================================
--- ChapterX.API/Controllers/ChaptersController.cs	(revision 877c13c3dd0934c1d31da7988d0d2c2c5925ed55)
+++ ChapterX.API/Controllers/ChaptersController.cs	(revision b373fea3e2c9d404606002f8e7ba265a82d68187)
@@ -5,4 +5,6 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Logging;
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
 
 namespace ChapterX.API.Controllers
@@ -40,4 +42,5 @@
 
         [HttpPost]
+        [Authorize]
         public async Task<ActionResult> Add([FromBody] AddRequest request)
         {
@@ -57,5 +60,6 @@
             }
 
-            var response = await _mediator.Send(request);
+            var callerId = int.Parse(User.FindFirstValue(JwtRegisteredClaimNames.Sub)!);
+            var response = await _mediator.Send(request with { CallerId = callerId });
             return Ok(response);
         }
@@ -66,5 +70,6 @@
         {
             _logger.LogInformation("Deleting chapter with ID: {ChapterId}", id);
-            var response = await _mediator.Send(new DeleteRequest(id));
+            var callerId = int.Parse(User.FindFirstValue(JwtRegisteredClaimNames.Sub)!);
+            var response = await _mediator.Send(new DeleteRequest(id, callerId));
             return Ok(response);
         }