Lookup provides notifications about validations finished asynchronously. They are sent for all completed single and batch validations if they required any background processing (requested single/batch validation has "status": "running").

Events ("event_type" in the webhook body):

`lookup.single_validation_completed`

resource_id is a single validation ID
resource_url points to the single validation results

`lookup.batch_validation_completed`

resource_id is a batch validation ID
resource_url points to the batch validation results