3 bookings a months is hardly free.
My trial ended when I saw the terms of service stipulated that I must be in the US. I'm in Canada, and cannot recommend it to my customer that violates their terms.
This plugin requires an external service @ $19.99/mo, it doesn't say that anywhere I could see in the description.
I'm not saying it's not worth it, just don't bother if you're looking for free/cheap.
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