Hello,
You can fetch the data from a third-party service and save it to your custom content collection .
We have a step by step guide on how to work with APIs: Corvid: Accessing Third-Party Services with the Fetch API . By following this article you can call a third-party service directly from your client-side code.
You can also work with the external database collections by following the instructions here .
More information about Wix Stores + Corvid you can find here .