Hi @MTS_Justin, It works again on my side too. I don't think it was a firewall or DNS issue on my side because the 504 error was returned by the server www.sandbox.paypal.com, so the server could be joined from me and the SSL certificate was valid, so it was a paypal server. I don't know the paypal architecture, but it looks like it was one of your servers which can't contact another one. But, as it is fixed, it is good for me. Thank you for your time.
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