PCI Booking’s outbound IP addresses, for whitelisting with third parties (PSPs, channel managers, hotel PMSs).
When PCI Booking makes an outbound call on your behalf - processing a payment through a PSP, relaying a request to a third party, or forwarding data to your own API - the request originates from PCI Booking’s infrastructure. Some third parties require these addresses to be whitelisted before they’ll accept traffic; without it, you’ll typically see a 401, 403, or a generic “not allowed from there” style rejection at the third party.
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