Add all files

app/Models/Credit.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Models;
+
+use App\Classes\Price;
+use Illuminate\Database\Eloquent\Casts\Attribute;
+use Illuminate\Database\Eloquent\Model;
+
+class Credit extends Model
+{
+    protected $fillable = [
+        'currency_code',
+        'amount',
+    ];
+
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function currency()
+    {
+        return $this->belongsTo(Currency::class, 'currency_code', 'code');
+    }
+
+    public function formattedAmount(): Attribute
+    {
+        return Attribute::make(
+            get: fn () => new Price(['price' => $this->amount, 'currency' => $this->currency])
+        );
+    }
+}