The new Notion API introduces many changes, and it is not backward compatible. Notion has posted this notice on its website:
Code changes required
If your integration is still using a previous API version and a user adds another data source to a database, the following API actions will fail:
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Create page when using the database as the parent
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Database read, write, or query
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Writing relation properties that point to that database
Notion has many tools that we cannot use because using them renders the Notion node unusable. Is it possible to update nodes to use the new API?