Import Exiting Private Key in Torus Infra

Our app is live in production and custody of the private is with platform currently. How to migrate the private keys to Torus infrastructure

When you say Platform, what exactly are you referring to? If you are referring about migrating between our SDKs , you can refer to the below documentation:

If this does not answer your question, please provide a more detailed explanation of what how your app is setup , which SDK? Is you app with another provider?