Questions about Go-Live requirements — corporate email and plan eligibility

Hello,

I'm going through the Go-Live process for a private custom integration and have a few questions before resubmitting:

1. Corporate email requirement
The production Admin account is currently registered with a @gmail address. Is it mandatory that the Admin account itself be registered with a corporate email domain, or is it sufficient that the person filling out the verification form uses a corporate email — even if the DocuSign account is linked to a @gmail address?

2. Plan eligibility
Is a specific DocuSign plan required to complete the Go-Live process for a private custom integration using JWT authentication? If so, which plans are supported?

3. Signing the form
Is it mandatory to complete the identity verification step (document photo + selfie) during the Go-Live form, or can the process be approved without it?