Task: Verify email deliverability with Hunter

n8n workflow JSON:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"Hunter","type":"n8n-nodes-base.hunter","position":[450,300],"parameters":{"email":"user@example.com","operation":"emailVerifier"},"credentials":{"hunterApi":"hunter api creds"},"typeVersion":1}],"connections":{"On clicking 'execute'":{"main":[[{"node":"Hunter","type":"main","index":0}]]}}}