Collect the escrow funds from the buyers in a similar way as normal payments. GoUrl will forward all payments to your wallet address/es (as website owner). When the project/order completed, GoUrl will send you email notifications that you need to send the payment to the seller (or make refund to the buyer) from your wallet address manually.
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I think one would want clarity on whether this marketplace is running on the clearnet or via TOR too, if you catch my drift