There are a couple of important things to note when creating a new Version for a Contract:

• The latest Version must be published before creating a new Version using the publish endpoint.
• There is a separate publish endpoint to use when publishing a Version: /v1.1/contracts/{contract_id}/versions/{id}/publish or /v1.1/contracts/{contract_id}/versions/@latest/publish.
• To get the latest Version or which Version is published, simply tack on @latest or @published to your GET call to /v1.1/contracts/{contract_id}/versions/.