Comprovante da Transação:

curl --request GET \
  --url https://gateway.3xpay.co/transaction/{transactionId}/receipt \
  --header 'api_key: <api-key>' \
  --header 'api_secret: <api-key>'

{
  "status": "SUCCESS",
  "data": {
    "receipt": "JVBERi0xLjMKJf...",
    "mimeType": "application/pdf"
  }
}