> For the complete documentation index, see [llms.txt](https://help.bluecore.vn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.bluecore.vn/flows/cac-activity.md).

# Các Activity

- [Timers](https://help.bluecore.vn/flows/cac-activity/timers.md)
- [Cron](https://help.bluecore.vn/flows/cac-activity/timers/cron.md)
- [Timer](https://help.bluecore.vn/flows/cac-activity/timers/timer.md)
- [Start at](https://help.bluecore.vn/flows/cac-activity/timers/start-at.md)
- [Clear timer](https://help.bluecore.vn/flows/cac-activity/timers/clear-timer.md)
- [OpenAI](https://help.bluecore.vn/flows/cac-activity/openai.md)
- [Check message sentiment](https://help.bluecore.vn/flows/cac-activity/openai/check-message-sentiment.md): Check sentiment of a input and return: positive, neutral, negative
- [Haravan](https://help.bluecore.vn/flows/cac-activity/haravan.md)
- [Check customer orders in timeframe](https://help.bluecore.vn/flows/cac-activity/haravan/check-customer-orders-in-timeframe.md): Verify whether the customer has any orders within the specified time range
- [Thông dụng](https://help.bluecore.vn/flows/cac-activity/thong-dung.md)
- [Sending a SMS message](https://help.bluecore.vn/flows/cac-activity/thong-dung/sending-a-sms-message.md): Send a message to a phone number
- [Create coupon](https://help.bluecore.vn/flows/cac-activity/thong-dung/create-coupon.md)