curl --request POST \
  --url https://sandbox-platform.jupico.com/v1/query/payouts/balanc/echeck/available \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "subMerchantId": "874767775007"
}
'

import requests

url = "https://sandbox-platform.jupico.com/v1/query/payouts/balanc/echeck/available"

payload = { "subMerchantId": "874767775007" }
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({subMerchantId: '874767775007'})
};

fetch('https://sandbox-platform.jupico.com/v1/query/payouts/balanc/echeck/available', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

const url = 'https://sandbox-platform.jupico.com/v1/query/payouts/balanc/echeck/available';
const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({subMerchantId: '874767775007'})
};

fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));

{
  "success": true,
  "message": "<string>",
  "code": "<string>",
  "data": {
    "amount": 123
  }
}