PayPal accepts payment even with incorrect CVV using Flutter WebView (V2 Orders API)

I'm using PayPal's v2/checkout/orders API in my Flutter app (v3.27.1) through a WebView (webview_flutter). The user completes the card payment inside the WebView.

Issue:Even with obviously invalid CVVs (e.g., "123"), PayPal completes the transaction and returns order.status = COMPLETED — both in Sandbox and Live.

Integration Setup:

• WebView-based custom checkout

• Card payments

• PayPal V2 Orders API

• Tested in both Sandbox and Live

Expected:Payment should fail or be declined if the CVV is incorrect.

Question:How can I enforce proper CVV validation when using PayPal’s V2 Orders API in a WebView flow?