curl --request GET \
  --url https://api.astronpay.co/api/v1/ledger/receivers/{id}/balance \
  --header 'x-api-key: <api-key>' \
  --header 'x-api-secret: <api-key>'

{
  "receiverId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "balances": [
    {
      "accountType": "RECEIVER_BRL",
      "currency": "BRL",
      "balance": "1500.00"
    }
  ]
}