const options = {method: 'GET', headers: {'x-api-key': '<api-key>'}};

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

{
  "status": "success",
  "message": "Wallets fetched successfully",
  "data": [
    {
      "id": "cfd2de64-a896-4405-8736-a1b2c3d4e5f6",
      "balance": 23094071,
      "currency": "NGN",
      "country": "NG"
    }
  ]
}