Means "Expensive".

The problem is that you are not in an Adobe environment in a website. Whatever script you use, has to
1. Open your PDF template
2. Replace the specific words / phrases with those that the client has typed in a form
3. Create a new PDF file with the specific data
4. Allow download of the new file

There are also other side issues related (deletion of the created file after the download, security issues etc).

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