curl --request POST \
  --url https://api.cleartalk.ai/callback/standardCampaignSms \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "contact_id": "I288bgrq0LlKLbW9tBng",
  "campaign_id": "fc464efb-0725-4d7e-a7f3-3f7d30ec403a",
  "first_name": "<string>",
  "last_name": "<string>",
  "full_name": "<string>",
  "email": "<string>",
  "phone": "<string>",
  "tags": "<string>",
  "country": "<string>",
  "date_created": "<string>",
  "company_name": "<string>",
  "full_address": "<string>",
  "contact_type": "<string>",
  "location": {},
  "workflow": {},
  "triggerData": {},
  "customData": {}
}
'