Report number of weekly created records in an app

This template shows how you can create reports on data in an app and share a summary in another app. Specifically, this example checks a Notion database for new submissions, filters for submissions with a specific tag, and then sends a Slack message with the number created this week. Setup instructions are located inside the workflow template.

Help me set up the n8n workflow "Report number of weekly created records in an app" (https://n8n.io/workflows/1931). It uses: Slack, Notion, Code. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.