- Go to https://www.notion.so/my-integrations, create a new integration and copy the secret key.
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Duplicate the database template https://www.notion.so/ptigas/Paper-notes-template-fce3116c09a44d6f81cb1503aac8b209 
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Share the collection with the account of the integration (e.g. zotion) 
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Copy link of collection which should look like https://www.notion.so/ptigas/[database id]?v=[blah]. Copy the database id which should look similar to009aeb7ed769410e8a27393c1c2d9e06.
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Install the XPI https://github.com/ptigas/zotion/releases/download/v0.1/zotion.xpi in zotero. Go to Tools / Zotion preferences and add the notion key and notion database id. Press save.