curl --request PATCH \
  --url https://{operatorDomain}/v1/public/bookings/sessions/{sessionId} \
  --header 'Content-Type: application/json' \
  --data '
{
  "selection": {}
}
'

{
  "data": {
    "sessionId": "bsx_01J9",
    "status": "open",
    "slotId": "slot_01J9",
    "currency": "EUR"
  }
}