Hello dear member of "nulled" forum. You could try to use this sollution. I personally use it. On its basis, you could build powerful system of live-support, dirrectly on your shop.
But you will need to make, tiny, quite simple, integration with Prestashop. Here is the link to the site of the project:
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You could also try a module, based on the same live-chat sollution. Here is the link to the site of the module:
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It is free.