fix registration issue and split parent controller into services

app/Services/Parents/ParentPaymentService.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Services\Parents;
+
+use CodeIgniter\Database\BaseConnection;
+
+class ParentPaymentService
+{
+    public function __construct(private readonly BaseConnection $db)
+    {
+    }
+
+    public function invoicesForParent(int $parentId, bool $includeRegisteredKids = false): array
+    {
+        if ($parentId <= 0) {
+            return [];
+        }
+
+        $select = $includeRegisteredKids ? 'invoices.*, registeredKids' : '*';
+
+        return $this->db->table('invoices')
+            ->select($select)
+            ->where('parent_id', $parentId)
+            ->get()
+            ->getResultArray();
+    }
+
+    public function markTuitionPaidForParent(int $parentId): void
+    {
+        if ($parentId <= 0) {
+            return;
+        }
+
+        $this->db->table('students')
+            ->where('parent_id', $parentId)
+            ->update(['tuition_paid' => 1]);
+    }
+}