V1 resources are backwards interoperable with v0 resources. You’ll be able create resources with v1 endpoints and interact with them using the v0 endpoints. Not all functionality in v1 may be accessible with v0 endpoints. For example you can create a business customer in v1 and access it via /v0/businesses but /v0/businesses may not provide all of the features of the v1 end point. New V1 features will be incrementally released.