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Request

Here is a short HTML code example of the reverse invoice (storno) for Számla Agent.

So the request must be multiform/form-data type and must contain one file on the name action-szamla_agent_st.

<html>
  <head><meta content="text/html; CHARSET=UTF-8"></head>
  <body>
    <form action="https://www.szamlazz.hu/szamla/" method="post" enctype="multipart/form-data">
      <input type="file" name="action-szamla_agent_st"><br>
      <input type="submit" name="generate" value="Reverse invoice">
    </form>
  </body>
</html>

You can also try out the same HTML code here