Some payment service providers will 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 will be passed to the payment service automatically by us where needed.

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Server-to-server

When you are creating transactions on behalf of a buyer via your own server without the use of Embed, you can pass the IP address of the buyer to us via the X-Forwarded-For header. 
curl --header "X-Forwarded-For: 192.168.0.2" https://api.example.gr4vy.app/...
We will automatically accept this header and pass it to the payment service where needed.
Not all endpoints pass the IP address to a connector. It is recommended to send the IP address whenever it is available.