Can not test using paypal sandbox

[sergeyClover]

Hi! I cant seem to find a way to test paypal payments using paypal sandbox. Every time the checkout.js is loaded from paypal.com using parameter env="production". I would like to find a way to test the payments using accounts created in paypal sandbox console. Is there an attribute that can be changed to set the environment to "sandbox", because i cant seem to find it.

Thank you in advance.