Task: Create or update a post in WordPress

n8n workflow JSON:
{"id":"60","name":"Create a post and update the post in WordPress","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[570,260],"parameters":{},"typeVersion":1},{"name":"Wordpress","type":"n8n-nodes-base.wordpress","position":[770,260],"parameters":{"title":"created from n8n","additionalFields":{}},"credentials":{"wordpressApi":"wordpress"},"typeVersion":1},{"name":"Wordpress1","type":"n8n-nodes-base.wordpress","position":[970,260],"parameters":{"postId":"={{$node[\"Wordpress\"].json[\"id\"]}}","operation":"update","updateFields":{"content":"This post was created using the n8n workflow."}},"credentials":{"wordpressApi":"wordpress"},"typeVersion":1}],"active":false,"settings":{},"connections":{"Wordpress":{"main":[[{"node":"Wordpress1","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Wordpress","type":"main","index":0}]]}}}