Create a policy (DSL)

Step 1: Go to the Policy Management page

1. Log on to the Fraud Detection console. In the navigation pane on the left, choose Decision Engine > Policy Management.

2. On the Policy Management page, click Create Policy.

3. Configure the basic parameters for the new policy.

Step 2: Configure Basic Information

Step 3: Configure the Policy Rules

1. In the If condition section, click +Add Condition to build the decision logic. You can combine multiple levels of conditions using AND/OR operators. For each condition, configure the following:

   1. Left-hand variable: Select a device variable, event field, custom variable, or system variable.

   2. Operator: Select an operator to evaluate the left-hand variable. The system provides compatible operators based on the variable type.

   3. Right-hand variable: After you select the left-hand variable and operator, enter a constant or a variable.

   To configure multiple logic conditions, click Add Condition. To quickly create multiple conditions, click Add Group.

2. In the Then action section, define the output. The output is what the decision engine returns when the policy conditions are met. When a policy is hit, it can produce several types of output, such as labels, scores, intermediate variables, and output variables.

   • Output label: Use descriptive labels, such as highRisk or pass. Separate multiple labels with commas (,). If multiple policies for the same event are configured with the same label, the system removes duplicates from the final output.

   • Output score: The score must be an integer from -1000 to 1000. When a policy is hit, its score is used to calculate the event score. The event score is the sum of the scores of all hit policies for that event.

   • Intermediate variable: An intermediate variable is a variable used during the policy calculation process. When a policy with an intermediate variable is hit, the variable is calculated or output according to the configured logic. You can use intermediate variables in other policies for the same event.

   • Output variable: In addition to scores and labels, you can also define custom output variables, such as event input parameters or intermediate variables. When a policy is hit, the custom output variables are included in the returned message.

3. Multi-branch logic.

   • Else if condition (Optional): You can add extra conditional branches, similar to the If condition.

   • Else action (Optional): You can define the action to take when none of the preceding conditions are met.

4. Save and enable the policy.

   1. After you configure the policy, click the Submit button at the bottom of the page.

   2. In the policy list, find the policy you created. The policy has a DSL identifier before its name. In the Actions column, click the icon, and then click Publish. The policy then takes effect.

You can now create and manage DSL policies in Alibaba Cloud Fraud Detection to customize fraud detection and prevention.