add more controllers and fix tests

app/Http/Controllers/Api/Finance/FeeCalculationController.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Http\Controllers\Api\Finance;
+
+use App\Http\Controllers\Api\BaseApiController;
+use App\Http\Requests\Fees\FeeRefundRequest;
+use App\Http\Requests\Fees\FeeTuitionTotalRequest;
+use App\Http\Resources\Fees\FeeRefundResource;
+use App\Http\Resources\Fees\FeeTuitionTotalResource;
+use App\Services\Fees\FeeRefundCalculatorService;
+use App\Services\Fees\FeeStudentFeeService;
+use Illuminate\Http\JsonResponse;
+
+class FeeCalculationController extends BaseApiController
+{
+    public function __construct(
+        private FeeRefundCalculatorService $refunds,
+        private FeeStudentFeeService $tuition
+    ) {
+        parent::__construct();
+    }
+
+    public function refund(FeeRefundRequest $request): JsonResponse
+    {
+        $payload = $request->validated();
+        $result = $this->refunds->calculateRefund($payload['students'], (int) $payload['parent_id']);
+
+        return response()->json([
+            'ok' => true,
+            'refund' => new FeeRefundResource($result),
+        ]);
+    }
+
+    public function tuitionTotal(FeeTuitionTotalRequest $request): JsonResponse
+    {
+        $payload = $request->validated();
+        $total = $this->tuition->totalTuitionFee($payload['students']);
+
+        return response()->json([
+            'ok' => true,
+            'tuition' => new FeeTuitionTotalResource([
+                'total_tuition' => $total,
+            ]),
+        ]);
+    }
+}