good

app/Models/PhoneVerification.php

@@ -2,13 +2,28 @@
 
 namespace App\Models;
 
+use Database\Factories\PhoneVerificationFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasOne;
 
 class PhoneVerification extends Model
 {
+    /** @use HasFactory<PhoneVerificationFactory> */
+    use HasFactory;
+
     protected $fillable = ['phone', 'otp', 'expires_at', 'verified'];
-    protected $casts = [
-        'expires_at' => 'datetime',
-        'verified' => 'boolean'
-    ];
+
+    protected function casts(): array
+    {
+        return [
+            'expires_at' => 'datetime',
+            'verified' => 'boolean',
+        ];
+    }
+
+    public function coupon(): HasOne
+    {
+        return $this->hasOne(Coupon::class, 'phone', 'phone');
+    }
 }