dodati payment kodovi, generisanje kodova, pdf view,promena payment page

backend/core/migrations/0016_paymentcode.py

@@ -0,0 +1,25 @@
+# Generated by Django 5.1.3 on 2025-06-19 18:42
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0015_control_description_control_safeguard_id'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='PaymentCode',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('code', models.CharField(max_length=10, unique=True)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('used', models.BooleanField(default=False)),
+                ('used_at', models.DateTimeField(blank=True, null=True)),
+                ('company', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='core.organization')),
+            ],
+        ),
+    ]