PayPal Demo Code

This is the prepared code for the NeuralNine YouTube video tutorial, before the AI redesign. It contains only the core functionality, so it's easy to learn from.

Two Flask demos using the PayPal Python SDK (sandbox):

• 1_shop – web shop with one-time payments
• 2_saas – SaaS app with subscriptions and webhooks

Requires uv and a PayPal developer account.

1. Web Shop

cd 1_shop
cp .env.example .env

Fill in .env:

• FLASK_SECRET – any random string
• PAYPAL_CLIENT_ID / PAYPAL_CLIENT_SECRET – from your sandbox app in the PayPal developer dashboard

Run it:

uv run app.py

Open http://localhost:5000.

2. SaaS App

cd 2_saas
cp .env.example .env

Fill in .env:

• FLASK_SECRET, PAYPAL_CLIENT_ID, PAYPAL_CLIENT_SECRET – same as above
• BASE_URL – your public URL (e.g. from ngrok http 5001)
• PAYPAL_WEBHOOK_ID – create a webhook in the developer dashboard pointing to <BASE_URL>/webhook
• PLAN_ID_BASIC / PLAN_ID_PRO – run uv run setup_plans.py once and paste the printed IDs

Run it:

uv run app.py

Open http://localhost:5001.

Warning: The apps run with debug=True. Exposing them through ngrok in debug mode is a security risk (the Werkzeug debugger allows remote code execution). Set debug=False before tunneling.

Docs

• PayPal JavaScript SDK v6
• PayPal Python Server SDK