Developed based on Alibaba Cloud Realtime Computing, the decision engine of Fraud Detection provides a one-stop platform that allows you to perform real-time computing by creating and running policies. The decision engine has been tested in e-commerce, media, and transaction scenarios over years. Relying on the risk control engine of Alibaba Cloud, the decision engine helps you manage events for personalized business scenarios, orchestrate complex policies in a visualized manner, associate multiple variables with events, and recognize risk scenarios. To use traditional risk control engines, you must master development and algorithm knowledge. In contrast, you can use the decision engine of Fraud Detection even if you are not a developer or an algorithm engineer. You can also apply big data and artificial intelligence（AI） algorithms to the decision engine to create intelligent policies for digital business operation.
1. Use the decision engine
The following figure shows how to use the decision engine.
2. Purchase the decision engine
The billing method of the decision engine is subscription. To purchase the decision engine, contact the Alibaba Cloud sales team or click [here](https://common-buy.aliyun.com/?commodityCode=saf#/buy).
Note: To deliver logs to a Log Service project in your Alibaba Cloud account, Fraud Detection must have the permission to access Log Service. If you have not authorized Fraud Detection to access Log Service, refresh the page after you purchase the decision engine, and then click Authorize. This authorization only grants Fraud Detection the permission to access logs generated for the decision engine. You can also complete the authorization in the Resource Access Management (RAM) console.