Task: Add articles to a Notion list by accessing a Discord slash command

n8n workflow JSON:
{"nodes":[{"name":"Webhook","type":"n8n-nodes-base.webhook","position":[450,300],"webhookId":"45e2593e-f25d-4be5-9b50-4a7c1e566a9e","parameters":{"path":"45e2593e-f25d-4be5-9b50-4a7c1e566a9e","options":{},"httpMethod":"POST","responseMode":"lastNode"},"typeVersion":1},{"name":"HTTP Request","type":"n8n-nodes-base.httpRequest","position":[850,200],"parameters":{"url":"=https://{{$json[\"body\"][\"data\"][\"options\"][0][\"value\"]}}","options":{},"responseFormat":"string"},"typeVersion":1},{"name":"Check type","type":"n8n-nodes-base.if","position":[650,300],"parameters":{"conditions":{"number":[{"value1":"={{$json[\"body\"][\"type\"]}}","value2":1,"operation":"notEqual"}]}},"typeVersion":1},{"name":"Extract Title","type":"n8n-nodes-base.htmlExtract","position":[1050,200],"parameters":{"options":{},"extractionValues":{"values":[{"key":"title","cssSelector":"title"}]}},"typeVersion":1},{"name":"Add Link to Notion","type":"n8n-nodes-base.notion","position":[1250,200],"parameters":{"resource":"databasePage","databaseId":"8a1638ce-da33-41b7-8fd9-37a4c272ba95","propertiesUi":{"propertyValues":[{"key":"Name|title","title":"={{$json[\"title\"]}}"},{"key":"Link|url","urlValue":"={{$node[\"Check type\"].json[\"body\"][\"data\"][\"options\"][0][\"value\"]}}"}]}},"credentials":{"notionApi":"Notion API Credentials"},"typeVersion":1},{"name":"Reply on Discord","type":"n8n-nodes-base.set","position":[1450,200],"parameters":{"values":{"number":[{"name":"type","value":4}],"string":[{"name":"data.content","value":"Added Link to notion"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Register URL","type":"n8n-nodes-base.set","position":[850,410],"parameters":{"values":{"number":[{"name":"type","value":1}],"string":[]},"options":{},"keepOnlySet":true},"typeVersion":1}],"connections":{"Webhook":{"main":[[{"node":"Check type","type":"main","index":0}]]},"Check type":{"main":[[{"node":"HTTP Request","type":"main","index":0}],[{"node":"Register URL","type":"main","index":0}]]},"HTTP Request":{"main":[[{"node":"Extract Title","type":"main","index":0}]]},"Extract Title":{"main":[[{"node":"Add Link to Notion","type":"main","index":0}]]},"Add Link to Notion":{"main":[[{"node":"Reply on Discord","type":"main","index":0}]]}}}