How to add Paypal checkout as an option to your app

PayPal Checkout lets customers pay quickly using their PayPal account, credit card, or bank account without sharing sensitive details directly with the seller. It’s a secure, trusted payment button that can be added to your website or app, so buyers don’t need to type in card details every time.

For example, if you’re selling handmade jewelry online, a shopper can click “Pay with PayPal,” log in, and complete the purchase in a few clicks. The money is then deposited into your PayPal business account, and you can transfer it to your bank.

Add PayPal checkout option.

Requirements:
– Integrate PayPal JS SDK with client ID in env variables.
– Frontend: "Pay with PayPal" button (minimal styling).
– On success: create `orders` row in Supabase.
– Redirect user to confirmation page.
– Include error handling + loading spinner.
– Output: working PayPal integration alongside Stripe.