# Explanation of Function Service Subscription Rules
[中文](/books/fe73f/page/ea5d2)
**I. Scope of Application**
For the functional services, you need to subscribe to the function package when your store is on the official version.
**II. Specification Explanation of Functional Service Duration**
(1) When you purchase functional services during the store service period, you can choose a specification that matches the remaining duration of the store or choose to purchase by year within the remaining duration of the store;
For example, if the remaining duration of your store is 370 days, you can choose to purchase a 370 - day functional service duration or purchase by 1 - year;
(2) When you renew the store version while purchasing functional services, you can choose to purchase a function package specification that matches the duration after renewing the store version;
For example, if the remaining duration of your store is 90 days and you renew it for 1 year at this time, you can purchase a 455 - day (90 days + 365 days) functional service duration or choose a specification less than 455 days, that is, purchase by 1 - year;
(3) If the service duration of your store has expired, please renew the store version first and then purchase the service duration;
**III. Calculation Rules for Functional Service Specifications**
When newly purchasing/renewing functional services:
Subscription price = (Pricing of functional services/365) \* (Remaining duration of the store - Remaining duration of the functional services)
When renewing the store version and purchasing/renewing functional services at the same time:
Subscription price = (Pricing of functional services/365) \* (Remaining duration of the store + Duration of the renewed version - Remaining duration of the functional services)
**IV. Ordering Path for Functional Services**
Click \[Service Subscription\] - \[Functional Services\] and select the functional services you need to purchase;Click \[Next Step\], select the duration of the functional services you need to purchase, and the services will be automatically activated after successful payment.
