Call this endpoint to generate a list of the contacts in NGP VAN that have been recently updated with new address or phone number information. The result will be an identifier of the saved list which can be used in the Canvass File Requests endpoint.

SyncPeriodStart and SyncPeriodEnd must be no more than 36 hours apart. If the specified time period exceeds 36 hours an HTTP 400 Bad Request response will be returned.

All dates passed to the API should be in Coordinated Universal Time (UTC) and formatted according to ISO 8601.

Successful requests will return an HTTP 200 response with a JSON body containing an integer identifying the saved list created by the API as SavedListId. This should be passed as a parameter to the subsequent request to the Canvass File Requests API.