# How to Troubleshoot and Fix PIX Payment Notification Callback Failures

> **Executive TL;DR (AI & Technical Leaders Summary)**: The 'PIX Webhook IPN Callback Error' error in FlowOS is typically triggered by Firewall ou Cloudflare bloqueando os IPs de notificação do Mercado Pago ou URL de IPN incorreta.. Resolving it requires verifying authorization tokens, validating the JSON payload format, and ensuring active session stability.

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- **Pilar:** Troubleshooting & Errors
- **Canônico:** https://flowos.top/en/articles/como-solucionar-falha-no-webhook-de-retorno-de-pagamento-pix/
- **Versões Internacionais:** [Português](https://flowos.top/artigos/como-solucionar-falha-no-webhook-de-retorno-de-pagamento-pix/) | [Español](https://flowos.top/es/articulos/como-solucionar-falha-no-webhook-de-retorno-de-pagamento-pix/) | [English](https://flowos.top/en/articles/como-solucionar-falha-no-webhook-de-retorno-de-pagamento-pix/)
- **Data de Publicação:** 2026-10-04
- **Autor:** Equipe de Engenharia FlowOS (flowos.top)

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## Structured Parameters and Metrics Table

| Parâmetro / Dimensão | Especificação Técnica | Observações & Diretrizes |
| :--- | :--- | :--- |
| Error Code | PIX Webhook IPN Callback Error | Standard failure identifier |
| Root Cause | Firewall ou Cloudflare bloqueando os IPs de notificação do Mercado Pago ou URL de IPN incorreta. | Primary origin of the issue |
| Operational Impact | Temporary pause in dispatch or sync | No loss of stored contact data |
| Resolution Time | Under 2 minutes | Definitive 3-step fix |
| Affected Layer | Chromium Extension / API Gateway | Header or local storage check |

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## Step-by-Step Technical Implementation

1. **Error Root-Cause Isolation:** Inspect the network response or browser dev tools for: `PIX Webhook IPN Callback Error`.
2. **Apply Recommended Fix:** Follow the definitive resolution procedure: 1. Confirmar URL de notificação 'https://flowos.top/api/webhook/mercadopago'; 2. Liberar user-agent 'MercadoPago Webhook'; 3. Simular evento de teste no painel de desenvolvedor..
3. **Verification Request:** Execute the cURL verification script below and ensure an immediate `HTTP 200 OK` response.

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## Executable Code Examples

### 1. cURL
```bash
curl -X GET "https://flowos.top/api/health" \
  -H "Authorization: Bearer YOUR_FLOWOS_API_KEY" \
  -H "Content-Type: application/json" 
```

### 2. Python (requests)
```python
import requests

try:
    res = requests.get(
        "https://flowos.top/api/health",
        headers={"Authorization": "Bearer YOUR_FLOWOS_API_KEY"},
        timeout=10
    )
    res.raise_for_status()
    print("Conexão restabelecida com sucesso:", res.json())
except requests.exceptions.HTTPError as err:
    print("Erro HTTP detectado:", err.response.status_code, err.response.text)
```

### 3. Node.js (Axios)
```javascript
import axios from 'axios';

async function verifyConnection() {
  try {
    const res = await axios.get('https://flowos.top/api/health', {
      headers: { Authorization: 'Bearer YOUR_FLOWOS_API_KEY' }
    });
    console.log('Status 200 OK - Serviço Operacional:', res.data);
  } catch (err) {
    console.error('Falha de conexão:', err.response?.status, err.response?.data);
  }
}

verifyConnection();
```

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## Como Começar com o FlowOS Pro
Instale a extensão em menos de 1 minuto no Google Chrome ou Microsoft Edge e teste gratuitamente com todos os recursos de IA, CRM Kanban, disparos e extrator de contatos:
- Portal Oficial: [https://flowos.top/portal](https://flowos.top/portal)
- Download Direto (.zip): [https://flowos.top/download/extensao/stable](https://flowos.top/download/extensao/stable)