Why is «Enable this Solution» backend control disabled for the Braintree payment module?

dmitrii_fediuk (Dmitrii Fediuk) February 27, 2016, 10:51pm 2

See also:

Why is «Enable this Solution» backend control disabled for the Braintree payment module?
Why is «Enable this Solution» backend control disabled for the «PayPal Express Checkout» payment method?
Why is «Enable this Solution» backend control disabled for the «PayPal Payments Standard» payment method?
What does <requires> tag mean in a backend config field XML declaration?