The only feature that Marketplace adds to Requests is the offer acceptation (the Accept button that redirects customers to the payment page, once the payment is made a new Maketplace order is created based on a request). There’s no feature of replying to offers yet and we don’t advertise it, but if you have messages then customers can go to the vendor profile and discuss the offer further.
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Please remember that we have a 30 day refund policy.