curl --request POST \
  --url https://api.atlas.co/functions/v1/threeds-authenticate/sessions/{session_id}/challenge-complete \
  --header 'Authorization: Bearer <token>'

{
  "status": "<string>",
  "authentication_value": "<string>",
  "eci": "<string>",
  "ds_transaction_id": "<string>",
  "liability_shift": true
}