reconstruction of the project

app/Models/PaypalTransaction.php

@@ -7,7 +7,10 @@ use App\Models\BaseModel;
 class PaypalTransaction extends BaseModel
 {
     protected $table = 'paypal_transactions';
-    protected $primaryKey = 'id';
+
+    // ✅ CI: useTimestamps = true (created_at/updated_at)
+    public $timestamps = true;
+
     protected $fillable = [
         'transaction_id',
         'payment_id',
@@ -26,5 +29,18 @@ class PaypalTransaction extends BaseModel
         'school_year',
         'semester',
     ];
-    public $timestamps = true;
+
+    protected $casts = [
+        'payment_id'       => 'integer',
+        'amount'           => 'decimal:2', // adjust precision if needed
+        'transaction_fee'  => 'decimal:2', // adjust precision if needed
+        // raw_data is often JSON; if it's JSON in DB, cast to array
+        'raw_data'         => 'array',
+    ];
+
+    /* Optional relationship */
+    public function payment()
+    {
+        return $this->belongsTo(Payment::class, 'payment_id');
+    }
 }