The Bigblue Pickup point selector is compatible with all Shopify plans. The difference between Plus and non-Plus plans is the availability of Checkout Extensibility (source), which enables you to add the pickup point selector to your checkout.
If you don’t have access to Checkout extensibility, the pickup point selector will appear on the Order Thank You and Order Status pages.
If this error appears when loading the Map, it may be that the Google Maps Javascript API Key is not properly setup. To know what is wrong, open your browser’s developer console and look for a message like this:
<aside>
💡 ExpiredKeyMapError
can be displayed for a few minutes if you’ve just created or updated your API key. We suggest retrying after 5-10 minutes.
</aside>
<aside>
💡 RefererNotAllowedMapError
means the Google Maps Javascript API key you supplied was configured with the wrong website restrictions. See Google Maps Setup.
</aside>
For other errors, consult Google’s error documentation:
Error Messages | Maps JavaScript API | Google for Developers
Shopify Plus merchants can enable the Allow app to block checkout option in the theme editor. When enabled, the customer will see an error message and be prevented from confirming their purchase if they have chosen a pickup point method but have yet to select a pickup point.
For all other situations, you can enable the Automatically assign a pickup point after the deadline in the app Settings. When the option is enabled, the Bigblue Pickup Points app will assign the nearest open pickup point to all orders that haven’t selected a pickup point after the pickup-point selection deadline (also configurable in your app Settings).