using cloude sonet 3.5 i have used the prompt to create the migrations and their files and installed api package

app/Models/Invoice.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Invoice extends Model
+{
+    use HasFactory;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array<int, string>
+     */
+    protected $fillable = [
+        'tenant_id',
+        'amount',
+        'status',
+        'due_date',
+        'student_user_id',
+        'payer_user_id',
+    ];
+
+    /**
+     * The attributes that should be cast.
+     *
+     * @var array<string, string>
+     */
+    protected $casts = [
+        'amount' => 'decimal:2',
+        'due_date' => 'date',
+    ];
+
+    /**
+     * Get the tenant that owns the invoice.
+     */
+    public function tenant(): BelongsTo
+    {
+        return $this->belongsTo(Tenant::class);
+    }
+
+    /**
+     * Get the student user that owns the invoice.
+     */
+    public function student(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'student_user_id');
+    }
+
+    /**
+     * Get the payer user that owns the invoice.
+     */
+    public function payer(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'payer_user_id');
+    }
+}