curl -X POST https://api.gmproxys.com/v1/add/balance \
  -H "X-API-Key: gm_SUA_CHAVE" \
  -H "Content-Type: application/json" \
  -d '{
    "user_id": "6198",
    "balance": 30
  }'

const response = await fetch("https://api.gmproxys.com/v1/add/balance", {
  method: "POST",
  headers: {
    "X-API-Key": "gm_SUA_CHAVE",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    user_id: "6198",
    balance: 30,
  }),
});

const data = await response.json();

import requests

response = requests.post(
    "https://api.gmproxys.com/v1/add/balance",
    headers={
        "X-API-Key": "gm_SUA_CHAVE",
        "Content-Type": "application/json",
    },
    json={
        "user_id": "6198",
        "balance": 30,
    },
)

print(response.json())

{
  "success": true,
  "message": "Success."
}

{
  "success": false,
  "message": "Invalid API token."
}

{
  "success": false,
  "message": "Proxy user not found."
}