it prints

py_app/app/forked_tray.py

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+import os
+import json
+import uuid
+from datetime import datetime, timedelta
+from flask import Blueprint, request, render_template, redirect, url_for
+
+bp_tray = Blueprint('forked_tray', __name__)
+PAIRING_FILE = os.path.join(os.path.dirname(__file__), '../instance/pairing_keys.json')
+
+# Utility to load pairing keys from file
+def load_pairing_keys():
+    if not os.path.exists(PAIRING_FILE):
+        return []
+    with open(PAIRING_FILE, 'r') as f:
+        return json.load(f)
+
+# Utility to save pairing keys to file
+def save_pairing_keys(keys):
+    with open(PAIRING_FILE, 'w') as f:
+        json.dump(keys, f, indent=2)
+
+@bp_tray.route('/download_extension', methods=['GET'])
+def download_extension():
+    pairing_keys = load_pairing_keys()
+    return render_template('download_extension.html', pairing_keys=pairing_keys)
+
+@bp_tray.route('/generate_pairing_key', methods=['POST'])
+def generate_pairing_key():
+    printer_name = request.form.get('printer_name')
+    if not printer_name:
+        return redirect(url_for('forked_tray.download_extension'))
+    # Generate key and warranty
+    pairing_key = str(uuid.uuid4())
+    warranty_days = 30
+    warranty_until = (datetime.utcnow() + timedelta(days=warranty_days)).strftime('%Y-%m-%d')
+    # Load, append, and save
+    keys = load_pairing_keys()
+    keys.append({
+        'printer_name': printer_name,
+        'pairing_key': pairing_key,
+        'warranty_until': warranty_until
+    })
+    save_pairing_keys(keys)
+    return render_template('download_extension.html', pairing_key=pairing_key, printer_name=printer_name, warranty_until=warranty_until, pairing_keys=keys)