OK thank you for bringing this to my attention. Having looked more into this, I am decommissioning the ShapeShift extension.
It is no longer suitable for use by the plugin. The end user must sign in using OAuth2 to gain access to a number of wallets that can be extrernal, and therefore not relevant to this plugin.
If you need to provide exchange functionality, you can set up markets using the Exchange extension. If the markets have enough liquidity (limit orders on the orderbook), you can provide similar functionality using the [wallets_exchange_market_order] shortcode: https://www.dashed-slug.net/exchange-swap-ui-plus-theme-templating/
Apologies for the trouble.