curl --request POST \
  --url https://api.{your-broker}.slate-labs.com/accounts/{login}/close \
  --header 'Content-Type: application/json' \
  --data '
{
  "reason": "<string>",
  "force": false
}
'

{
  "login": 123,
  "status": "<string>",
  "reason": "<string>",
  "balance_at_closure": 123
}