The Magento 2 Multiple Wishlists extension now supports not only REST APIs but GraphQL APIs as well. Please find the details in the two links below.
REST API
This list contains all the REST APIs that Magento 2 Multiple Wishlists extension supports.
Magento 2 Multiple Wishlists REST API Support
GraphQL API
Here comes the list of GraphQL APIs that Magento 2 Multiple Wishlists extension supports.
Magento 2 Multiple Wishlists GraphQL API Support
Notes
- Core wishlist is the wishlist automatically created by Magento immediately after a customer account is successfully created.
- BSS Multi Wishlist is for creating new wishlists.
- "multi_wishlist_id = 0" represents the wishlist item added by core wishlist.
- These APIs only work on Magento 2.4.x.