🎯 Teste PIX Checkout API - Implementação Oficial
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📝 Payload:
{
    "transaction_amount": 100,
    "description": "Assinatura Plano Teste",
    "payment_method_id": "pix",
    "payer": {
        "email": "customer@example.com"
    }
}

HTTP Status: 401

Status: 401
Error: invalid access token

Full response:
{
    "code": "unauthorized",
    "message": "invalid access token"
}

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