Task: Send an SMS using MSG91

n8n workflow:
{"name":"Send an SMS using MSG91","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"Msg91","type":"n8n-nodes-base.msg91","position":[450,300],"parameters":{"to":"","from":"","message":""},"credentials":{"msg91Api":""},"typeVersion":1}],"active":false,"settings":{},"connections":{"On clicking 'execute'":{"main":[[{"node":"Msg91","type":"main","index":0}]]}}}