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src/app/Models/Payment.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Payment extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'installment_application_id',
+        'installment_schedule_id',
+        'user_id',
+        'transaction_no',
+        'receipt_no',
+        'biller_code',
+        'ref_1',
+        'ref_2',
+        'amount',
+        'status',
+        'payload',
+        'paid_at',
+        'remarks',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'amount' => 'decimal:2',
+            'payload' => 'array',
+            'paid_at' => 'datetime',
+        ];
+    }
+
+    public function application(): BelongsTo
+    {
+        return $this->belongsTo(InstallmentApplication::class, 'installment_application_id');
+    }
+
+    public function schedule(): BelongsTo
+    {
+        return $this->belongsTo(InstallmentSchedule::class, 'installment_schedule_id');
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+}