first commit

Controllers/WorkerBillingController.cs

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+using Fitness_core_BE.DTOs.PlatformBilling;
+using Fitness_core_BE.Helpers;
+using Fitness_core_BE.Interfaces.Services;
+using Fitness_core_BE.Models.IOs;
+using Microsoft.AspNetCore.Mvc;
+using static Fitness_core_BE.Helpers.ApiResponseHelper;
+
+namespace Fitness_core_BE.Controllers
+{
+    // Trusted-machine-caller surface for the scheduled subscription-billing worker — not a
+    // human/agent session, so it's gated by RequireWorkerKeyAttribute (X-Worker-Key) instead
+    // of CustomMiddleware/JwtMiddleware.
+    [ApiController]
+    [Route("api/internal/billing")]
+    [RequireWorkerKey]
+    public class WorkerBillingController : ControllerBase
+    {
+        private readonly IPlatformBillingService _platformBilling;
+
+        public WorkerBillingController(IPlatformBillingService platformBilling)
+        {
+            _platformBilling = platformBilling;
+        }
+
+        [HttpPost("run-subscription-charges")]
+        public async Task<ActionResult<ApiResponse<SubscriptionChargeRunResult>>> RunSubscriptionCharges()
+        {
+            return Response(await _platformBilling.RunAndChargeSubscriptionBillingAsync(HttpContext.RequestAborted));
+        }
+    }
+}