WooCommerce PayPal Payments < 3.4.0 - Unauthenticated Order Key and Customer PII Disclosure via IDOR

Description

The plugin is vulnerable to Sensitive Information Disclosure due to an Insecure Direct Object Reference via the `enqueue_paypal_insights_script_on_order_received()` function, due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to obtain sensitive order information including order keys, which can then be leveraged to access full customer billing details (name, email, phone, address) via the WooCommerce Store API within a 10-minute grace period after order creation.