"Soft" deletes a scheduled invoice from a merchant's account. The scheduled invoice will exist in the database, but will not be accessible by the merchant or customers. It sets the deleted_at field to the time of deletion, stopping the scheduled future charges. Deleting an invoice doesn't change its active state, but it sets next_run_at to null and sets future_occurrences to an empty set. Scheduled invoices with a value other than null in the deleted_at field are inaccessible to the merchant or customers.