Update README.md

README.md

@@ -58,6 +58,12 @@ Welcome to join the [Tuya Beta Test Program](https://pages.tuya.com/develop/Home
 | 2406 | skill id invalid | <ul><li>Cloud project created before May 25, 2021: Your cloud project on the [Tuya IoT Platform](https://iot.tuya.com/cloud/) should be created after May 25, 2021. Otherwise, you need to create a new project. For more information, see [Operation on the Tuya IoT Platform](https://developer.tuya.com/en/docs/iot/migrate-from-an-older-version?id=Kamee9wtbd00b#title-3-Operation%20on%20the%20Tuya%20IoT%20Platform). </li><li> Cloud project created after May 25, 2021, but it is not associated with your **TuyaSmart** or **SmartLife** app account. Please associated it in the Tuya IoT platform. For more information, see [Link devices by app account](https://developer.tuya.com/en/docs/iot/Platform_Configuration_smarthome?id=Kamcgamwoevrx#title-3-Link%20devices%20by%20app%20account). </li></ul></li></ul>|
 | 28841105 | No permissions. This project is not authorized to call this API | You have not authorized your cloud project to use the required APIs. Subscribe to the following required [API products](https://developer.tuya.com/en/docs/iot/applying-for-api-group-permissions?id=Ka6vf012u6q76#title-2-Subscribe%20to%20cloud%20products) and [authorize your project to use them](https://developer.tuya.com/en/docs/iot/applying-for-api-group-permissions?id=Ka6vf012u6q76#title-3-Authorize%20projects%20to%20call%20the%20cloud%20product).   <ul><li>Authorization</li><li>Smart Home Devices Management</li><li>Smart Home Family Management</li><li>Smart Home Scene Linkage</li><li>Smart Home Data Service</li><li>Device Status Notification</li></ul> |
 
+## FAQ
+
+**Q: Will I be billed after the 1-year free trial of the API product expires?**
+
+A: After expiration, you can renew the subscription for free. The Trial Edition allows you to use all free API products but puts limits on the quota of API calls. For more information about the quota, see [Pricing](https://developer.tuya.com/en/docs/iot/membership-service?id=K9m8k45jwvg9j).
+
 ## Users
 
 If you are a smart home geek and have a bundle of devices from different platforms, this step-by-step tutorial will help you make devices HomeKit-enabled and then develop Tuya Homebridge plugins.