Updates to Zip Pay Web Checkouts

We are currently using the Zip Pay / Zip Money Payment Method plugin version 1.0.0

We have just been informed that there is a change to the Web Checkouts

Please see this URL for further information: developers.zip.co/v11/docs/checkouts-api-merchants

They recommend to:

Update your API base urls for both sandbox and production.
Determine if you are using our checkouts Javascript. If so, update your script base url.

I don't see anywhere in the plugin where we can update the API base URL. Is it hard coded in the plugin?

Also, are we using their checkouts Javascript? If so, we need to update that URL also.

Thanks for your assistance.