PULL process from a VISA managed server and SSH key authentication

We're implementing Expenses module and a PULL process from a VISA managed server to the Corporate card task. VISA have a service referred to as "VISA File Exchange Service" (VFES) that provides the ability for systems like Oracle ERP Cloud to connect to a VISA server and pull the file down for loading. We need to provide a SSH key for authentication.

In some documentation, we've read that ERP Cloud doesn't support SSH. Visa send us an implementation guide that said "The client must generate a public key and send it to Visa to perform the public key authentication. The public key must be a SSH2 RSA key (format) with 2048 bits key length. The ssh-keygen tool that is part of the OpenSSH client can be used to generate the key."