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Some payment service providers require the IP address of the buyer to be sent to them for anti fraud purposes.

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Embed

By default, when using Embed the IP address of the buyer is passed to the payment service automatically where needed.

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Server-to-server

When creating transactions on behalf of a buyer via a server without the use of Embed, pass the IP address of the buyer via the X-Forwarded-For header. 
curl --header "X-Forwarded-For: 192.168.0.2" https://api.example.gr4vy.app/...
Most of the SDKs support passing through this header on the POST transactions call.
This header is automatically accepted and passed to the payment service where needed. If the header is not provided and the service provider recommends passing the IP address, the IP address of the request’s origin is forwarded instead.
Not all endpoints pass the IP address to a connector. It is recommended to send the IP address whenever it is available.