# Configure subscriptions

Configuring the Digital River app for subscriptions requires you to perform a few additional steps. You must identify for each Cart Item object whether the product is a subscription with additional relevant information as described below. You should create a trigger, flow, or other mechanism to automate the population of this data as Cart Items are added to the Cart. 

The Digital River app will identify whether a product is a subscription by the value in the **Recurring Line Item** field **(API name: digitalriverv3\_\_Recurring\_Line\_Item\_\_c)** which is on [Cart Item](https://docs.digitalriver.com/salesforce-lightning/salesforce-lightning-b2b-commerce-api-1.0.1/extend-the-salesforce-lightning-app/broken-reference) object. 

When the **Recurring Line Item** field value is`true`, it indicates the product is a subscription. If the **Recurring Line Item** field value is`false`,  it indicates the product is not a subscription.

You will need to populate the **Recurring Line Item** field accordingly so that the app can identify whether a product is a subscription. If the field is not populated, the application will treat the product as a non-subscription.  

The application will optionally allow you to specify the subscription's `startTime` and `endTime`. The following information is included in the `subscriptionInfo` field and sent across to Digital River during the [create checkout](https://www.digitalriver.com/docs/digital-river-api-reference/#operation/createCheckouts) API call: 

* If the `startTime` and `endTime` are specified, then this information will be included in the `subscriptionInfo` block.
* If only the `endTime` is specified but not the `startTime`, then the app will default the `startTime` to the current date/time.
* If the `endTime` is not specified, then both the `startTime` and `endTime` are not included in the `subscriptionInfo` block.

Finally, the following optional fields are available to be populated on the Cart Item. If specified, the values will be sent to Digital River.

| Field            | Description                                                                                            |
| ---------------- | ------------------------------------------------------------------------------------------------------ |
| `freeTrial`      | This field has a  `true` or `false` value that indicates whether a free trial period is being offered. |
| `subscriptionId` | This field can be used to supply the client's subscription identifier (if applicable).                 |