Our sandbox and production modes are functionally the same, so going live is mostly a matter of switching from the sandbox host (https://sandbox.signinc.com) to the production host (https://api.signinc.com) and swapping out your API Credentials.
To retrieve your production credentials, sign in to your production account and go to Settings.
Make sure you're not using any sandbox objects — users, templates, sign requests, fields, participants, etc are not usable in production mode.
API requests in production mode will be billed in accordance with your plan.