curl -X POST 'https://api.goatpay.com.br/v1/subaccount/transfer' \
  -H 'X-API-Key: gp_live_SUA_CHAVE' \
  -H 'Content-Type: application/json' \
  -d '{
    "fromSubaccountId": "clx_sub_a",
    "toSubaccountId": "clx_sub_b",
    "amount": 30,
    "description": "Repasse interno"
  }'

{
  "success": true,
  "message": "Transferência entre subcontas",
  "data": {
    "outTransactionId": "clx_tx_from",
    "inTransactionId": "clx_tx_to",
    "amount": 30
  },
  "requestId": "req_abc123"
}