No “Pro” plan, no site limit, no paid add-ons. One subscription, that’s it.
Yes, 14 days. You pay nothing if you cancel before it ends. The trial is offered only once per account.
From your App Store account (Settings › your name › Subscriptions) or Google Play (Profile › Payments & subscriptions). Access stays active until the end of the paid period.
Yes: it’s linked to your Board WP account. Sign in with the same email on your other devices.
The receipt is issued by Apple or Google, in the purchase history of your store account.