curl --request POST \
  --url https://api.pathstack.io/refresh \
  --header 'Content-Type: application/json' \
  --data '
{
  "sub": "<string>",
  "refresh_token": "<string>"
}
'

{
  "data": {
    "token_type": "<string>",
    "expires_in": 123,
    "access_token": "<string>"
  }
}