Barista Script is totally free, for both personal and commercial project.
But any kind of donations are also very appreciated.
For donation support just click the donation link below:

http://paypal.me/hptypework

It will take you to my PayPal donation page.
And no PayPal account required for sending donation.

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http://creativemarket.com/hptypework

Also find me on:
http://instagram.com/hptypework