Upgrading From 3.15 To 3.16
customerIpAddress field
Saleor 3.16 added customerIpAddress to TRANSACTION_INITIALIZE_SESSION and TRANSACTION_PROCESS_SESSION webhooks.
This field is calculated based on the request's IP address. It might be consumed by Payment App and passed to a payment provider for fraud checking.
If you are making requests on behalf of your customers (for example if you use a proxy or have a backend-for-frontend architecture), make sure to provide customerIpAddress parameter in transactionInitialize and transactionProcess mutations:
Not providing customerIpAddress will result in an incorrect calculation of IP Address by Saleor that is sent to the Payment App, which might cause transactions to fail.
Future Saleor version might make this field required if called by an app.
To see an example how customerIpAddress might be consumed by a Payment App, see Adyen App docs