Task: Get all the contacts from GetResponse and update them

n8n workflow JSON:
{"id":"116","name":"Get all the contacts from GetResponse and update them","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"GetResponse","type":"n8n-nodes-base.getResponse","position":[450,300],"parameters":{"options":{},"operation":"getAll","returnAll":true},"credentials":{"getResponseApi":"getresponse-api"},"typeVersion":1},{"name":"IF","type":"n8n-nodes-base.if","position":[650,300],"parameters":{"conditions":{"string":[{"value1":"={{$node[\"GetResponse\"].json[\"campaign\"][\"name\"]}}","value2":"n8n","operation":"notEqual"}]}},"typeVersion":1},{"name":"GetResponse1","type":"n8n-nodes-base.getResponse","position":[860,200],"parameters":{"contactId":"={{$node[\"IF\"].json[\"contactId\"]}}","operation":"update","updateFields":{"campaignId":"WRVXO"}},"credentials":{"getResponseApi":"getresponse-api"},"typeVersion":1},{"name":"NoOp","type":"n8n-nodes-base.noOp","position":[860,400],"parameters":{},"typeVersion":1}],"active":false,"settings":{},"connections":{"IF":{"main":[[{"node":"GetResponse1","type":"main","index":0}],[{"node":"NoOp","type":"main","index":0}]]},"GetResponse":{"main":[[{"node":"IF","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"GetResponse","type":"main","index":0}]]}}}