const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    currency: 'NGN',
    country: 'NG',
    account: {accountNumber: '0690000032', sortCode: '044'}
  })
};

fetch('https://sandboxapi.me-cash.com/v1/account/enquiry', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "status": "success",
  "message": "Operation completed successfully.",
  "data": {
    "accountNumber": "0690000032",
    "accountName": "JOHN DOE",
    "bankName": "ACCESS BANK NIGERIA",
    "sortCode": "044",
    "currency": "NGN",
    "country": "NG"
  }
}