curl -X POST 'https://api.goatpay.com.br/v1/refunds/create' \
  -H 'X-API-Key: gp_live_SUA_CHAVE' \
  -H 'Content-Type: application/json' \
  -d '{ "transactionId": "clx_pix_in", "refundId": "devolucao-pedido-123", "amount": 100, "nature": "ORIGINAL", "description": "Estorno pedido #123" }'

{
  "success": true,
  "message": "Reembolso PIX solicitado com sucesso",
  "data": {
    "id": "clx_pix_in",
    "status": "PROCESSING",
    "amount": 100,
    "endToEndId": "E12345678202505301234567890123456",
    "refund": {
      "status": "PROCESSING",
      "refundId": "devolucao-pedido-123"
    }
  },
  "requestId": "req_abc"
}