# Introduction Feishu's message cards have interactive capabilities. If your enterprise involves an internal system approval process, you can connect the system with the Feishu open platform. When the approval process is created, an interactive message card can be automatically sent to the approver. While ensuring timely notification to the approver, the approver can also Complete the approval directly through the message card to improve work efficiency. Through this tutorial, you can learn how to efficiently handle business approvals through interactive message cards.warning Due to iterations, this tutorial is no longer being updated. It is recommended to use the latest tutorial [Develop a card interactive bot](https://open.feishu.cn/document/uAjLw4CM/uMzNwEjLzcDMx4yM3ATM/develop-a-card-interactive-bot/introduction). ## Achieve the effect This tutorial takes the approval scenario within the enterprise as an example. After the system generates an approval flow, the system will send an interactive message card (as shown in the figure below) to the approver in Feishu. The approver can efficiently process business approval by operating the card. . ![](//sf3-cn.feishucdn.com/obj/open-platform-opendoc/6dd4794ba06ab1de3c51679b0c5d55a3_BKmgtHfAk7.png?height=1000&lazyload=true&maxWidth=700&width=1640) ## Implementation principle Through the application capabilities, message services, and message cards of the Feishu open platform, the ability to quickly process the approval process is realized. The implementation principle is shown in the figure below. ![](//sf3-cn.feishucdn.com/obj/open-platform-opendoc/e0431f942ffe683ab3c209bc49e88e1e_EbCf9w4jPv.png?height=1533&lazyload=true&maxWidth=700&width=1640) ## OpenAPI used This tutorial needs to use the following OpenAPI to send message cards. **[Method (API)](https://open.feishu.cn/document/ukTMukTMukTM/uITNz4iM1MjLyUzM)** | Permission requirements (satisfy any) | **[Access credentials](https://open.feishu.cn/document/ukTMukTMukTM/uMTNz4yM1MjLzUzM)** ---|---|--- [Send message](https://open.feishu.cn/document/uAjLw4CM/ukTMukTMukTM/reference/im-v1/message/create)
`POST` https://open.feishu.cn/open-apis/im/v1/messages | Send messages as an app(im:message:send_as_bot)
Read and send messages in private and group chats(im:message)
Send messages V2(im:message:send) | `tenant_access_token`