Test error scenarios with PayPal plugin

Is it possible to test error scenarios with the PayPal plugin? E.g. capture failed etc.

Litium version: 6.1.1

Check the Paypals documentation:
https://developer.paypal.com/docs/classic/lifecycle/sb_error-conditions/

Yes, but the API calls are hidden inside the plugin. How can I add a header or modify the note field?

Sorry, we are not enabling the error scenarios as at now in the AddOn.