htaccess? Or another way?

Hi guys,
My cousin is oing a download our album/one of our tracks (payment via paypal) and wondered if there is an easy way to password protect the tracks via .htacess and if there can be a 1 time password entry (for the download) or if there a pre built scripts for this function, obviously there needs to be an expiry on the password to download the tracks an possibly intergrated with paypal?

 

 

 

 

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