Task: Get all contacts from Mautic

n8n workflow JSON:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"Mautic","type":"n8n-nodes-base.mautic","position":[450,300],"parameters":{"options":{},"operation":"getAll","authentication":"oAuth2"},"credentials":{"mauticOAuth2Api":"mautic_creds"},"typeVersion":1}],"connections":{"On clicking 'execute'":{"main":[[{"node":"Mautic","type":"main","index":0}]]}}}