fix(coupon): correct knows issues

app/Http/Controllers/V1/User/CouponController.php

@@ -11,11 +11,11 @@ class CouponController extends Controller
 {
     public function check(Request $request)
     {
-        $request->validate([
-            'code' => 'required|string',
-            'plan_id' => 'required|integer',
-            'period' => 'nullable|string',
-        ]);
+        // $request->validate([
+        //     'code' => 'required|string',
+        //     'plan_id' => 'required|integer',
+        //     'period' => 'nullable|string',
+        // ]);
         if (empty($request->input('code'))) {
             return $this->fail([422,__('Coupon cannot be empty')]);
         }

app/Services/PlanService.php

@@ -114,7 +114,8 @@ class PlanService
      */
     public static function convertToLegacyPeriod(string $period): string
     {
-        return Plan::LEGACY_PERIOD_MAPPING[$period] ?? $period;
+        $flippedMapping = array_flip(Plan::LEGACY_PERIOD_MAPPING);
+        return $flippedMapping[$period] ?? $period;
     }
 
     /**