curl --request POST \
  --url https://api.plais-sandbox.finventi.com/api/v1/balances \
  --header 'Content-Type: application/json' \
  --data '
{
  "balances": [
    {
      "amount": 10000,
      "currency": "EUR",
      "payer": {
        "account": "DE12345678901234567890",
        "bic": "HABALT22TIP",
        "member_code": "<string>",
        "name": "John Doe"
      }
    }
  ]
}
'

{
  "result": {
    "accepted": 123
  }
}