Check account balance

{
  "amount": 998389,
  "currency": "GBP",
  "timestamp": "2024-05-29T09:57:41+00:00"
}

{
  "exception": {
    "code": 403,
    "message": "Access Denied."
  }
}

{
  "exception": {
    "code": 422,
    "message": "Provider does not support this function"
  }
}