Creates a subscription to a block for a user. The user will receive change notifications for the block.

{"stackTrail":"components:schemas:Subscription","oasType":"schema","type":"unknown","title":"Subscription is a subscription to a board, card, etc, for a user or channel.","extensionFields":{"x-go-package":"github.com/mattermost/focalboard/server/model"}}

{"stackTrail":"components:schemas:User","oasType":"schema","type":"unknown","description":"User is a user","extensionFields":{"x-go-package":"github.com/mattermost/focalboard/server/model"}}