curl --request POST \
  --url https://api.atlas.co/functions/v1/sessions/{session_id}/cancel \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "cancellation_reason": "duplicate"
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "object": "payment_session",
  "status": "requires_payment_method",
  "amount": 123,
  "currency": "<string>",
  "client_secret": "<string>",
  "customer_email": "<string>",
  "customer_name": "<string>",
  "capture_method": "automatic",
  "payment_method_types": [
    "card"
  ],
  "metadata": {},
  "created_at": "2023-11-07T05:31:56Z",
  "livemode": true
}