POST
⦁ /sign_in - output params {email; password}
⦁ /sign_up - output params {email; password; name}
GET
⦁ /periods - output params {token}
⦁ /game - output params {token, game_id}
⦁ /game_complete - output params {token, game_id}
⦁ /buy_period - output params {token, period_id}