Webhooks
As a reseller the primary way we recommend you receive website changes is via Webhook, this will enable you to receive the notification for the website the moment it happens. So you can trigger an email, or some other notification, or simply add them to a table to show the user a list of all their feed items.
To set up a webhook, you can use the Webhooks API to add or remove your webhooks.
You can read about Feed Items - There are a number of different types of feed items that will be sent via the Webhook and you can see example payloads, and example of a Webhook payload can be found here - Broken Links