Subscription Based Features

I have one module where features are allowed based on package selected .For example i have following plans

Free Plan 
    -Basic information
Silver Plan 
    -Basic information
    -Review
    -Email 10 per month 
Golden Plan 
    -Basic information
    -Review
    -Email 60 per month 

I have created following tables

Plan

id | plan_name | plan_key | slug | plan_sub_title | plan_days | is_actve | valid from | valid to  

features

id | feature_name | description 

plan_features

id | plan_id | feature_id | value

My problem is, How to allow only those features to each plan based on features assigned dynamically and also how to handle email value to plan

via Chebli Mohamed