The 'Coinbase Advanced Trade API' <https://docs.cdp.coinbase.com/api-reference/advanced-trade-api/rest-api/introduction> lets you manage orders, portfolios, products, and fees with the new v3 endpoints.
Please see the following video on how to save your tokens to use with this r-package: https://www.youtube.com/watch?v=fV-xqM7jm9A