Combining multiple verification checks for a single user is achieved using the person-id. This id tells IDAAS to group requests submitted using it, and generate a combined score across them. A new person-id will be created if it is not supplied with a request, so you should retrieve it from your initial verification check, and supply it to all further requests in the journey to tie them all together. For more information on how to submit a person-id for a specific request type, see our API Reference.
All verification checks are recorded for auditing and review purposes. You can access and query the log of your checks via the Verification History API, or using your IDAAS portal.