Task: Mass messaging using Sms77

n8n workflow:
{"id":17,"name":"Wish my friends","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[-300,40],"parameters":{},"typeVersion":1},{"name":"Google Contacts","type":"n8n-nodes-base.googleContacts","position":[-60,40],"parameters":{"fields":["phoneNumbers","names"],"options":{},"operation":"getAll","returnAll":true},"credentials":{"googleContactsOAuth2Api":{"id":"19","name":"Google Contacts account"}},"typeVersion":1},{"name":"Sms77","type":"n8n-nodes-base.sms77","position":[580,20],"parameters":{"to":"={{$node[\"Google Contacts\"].json[\"phoneNumbers\"][\"undefined\"][0]}}","from":"+491771783130","message":"Hey Pradyumna , This is kaushik","options":{}},"credentials":{"sms77Api":{"id":"20","name":"Sms77 account"}},"typeVersion":1},{"name":"IF","type":"n8n-nodes-base.if","position":[160,40],"parameters":{"conditions":{"string":[{"value1":"={{$node[\"Google Contacts\"].json[\"names\"][\"displayName\"].toLowerCase()}}","value2":"germany","operation":"notContains"}],"boolean":[]}},"typeVersion":1},{"name":"All Contacts display","type":"n8n-nodes-base.set","position":[100,-140],"parameters":{"values":{"number":[{"name":"Mobile Number","value":"={{$node[\"Google Contacts\"].json[\"phoneNumbers\"][\"undefined\"][0]}}"}],"string":[{"name":"Recipient Name","value":"={{$node[\"Google Contacts\"].json[\"names\"][\"displayName\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Recipients","type":"n8n-nodes-base.set","position":[380,20],"parameters":{"values":{"number":[{"name":"Mobile Number","value":"={{$node[\"IF\"].json[\"phoneNumbers\"][\"undefined\"][0]}}"}],"string":[{"name":"Recipient Name","value":"={{$node[\"IF\"].json[\"names\"][\"displayName\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1}],"active":false,"settings":{},"connections":{"IF":{"main":[[{"node":"Recipients","type":"main","index":0}]]},"Recipients":{"main":[[{"node":"Sms77","type":"main","index":0}]]},"Google Contacts":{"main":[[{"node":"IF","type":"main","index":0},{"node":"All Contacts display","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Google Contacts","type":"main","index":0}]]}}}