# Generate Work Orders on Maintenance Plans with Apex

The **Generate Work Orders** action on maintenance plans can also be called using Apex code. The following code sample creates work order records by making an Apex callout to the `generateWorkOrder` action REST API resource.

You can use this code sample in several different ways:

- Add it to Apex controller code for an Aura component, and tie it to a custom UI or app functionality
- Use it in an Apex trigger to semi-automate the creation of the work orders (for example, whenever a maintenance plan is created or updated)
- Use it in an Apex REST service to create work orders when called from an external integration service

:::note
- This code sample assumes that you have remote site settings enabled to make REST callouts. For more information, see [Adding Remote Site Settings](https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_callouts_remote_site_settings.htm).
- The mock maintenance plan ID in the code sample is `1MPR000000000Bu`.
- This code sample references API version 45.0, but can be used with any version from 40.0 onward.
:::

**API Endpoint (v45.0):** `/services/data/v45.0/actions/standard/generateWorkOrders`

```apex
String salesforceHost = System.Url.getSalesforceBaseURL().toExternalForm();
String url = salesforceHost + '/services/data/v45.0/actions/standard/generateWorkOrders';
// Create HTTP request
HttpRequest request = new HttpRequest();
request.setEndpoint(url);
request.setMethod('POST');
request.setHeader('Content-Type', 'application/json;charset=UTF-8');
request.setHeader('Authorization', 'OAuth ' + UserInfo.getSessionId());
// Set the body as a JSON object
request.setBody('{"inputs" : [{"recordId" : "1MPR000000000Bu"}]}');
Http http = new Http();
HttpResponse response = http.send(request);
// Parse the JSON response
if (response.getStatusCode() != 201) {
    System.debug('The status code returned was not expected: ' +
    response.getStatusCode() + ' ' + response.getStatus());
} else {
    System.debug(response.getBody());
}
```

**See Also**

- [Salesforce Actions Developer Guide: Generate Work Orders Actions](https://developer.salesforce.com/docs/atlas.en-us.api_action.meta/api_action/actions_obj_generate_work_orders.htm)