How to create a temporary password for my web site

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HTML

jQuery

Hi,

I have a website in weebly, in that I want to add few pages which should be seen only by my clients.
whenever I need to show a particular web page to my client, I should be able to generate a temporary password and give it to my client, so that he can visit that page, once he logs into that page, that password should expire.
I should generate different password for each of clients and that should be of one time use.

How can I do that?

Thanks in advance.