curl --request POST \
  --url https://api.pocketflows.com/campaigns/{id} \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "<string>",
  "steps": [
    {
      "type": "email",
      "custom_step_id": "<string>",
      "email_template_id": "<string>"
    }
  ],
  "segment": "<string>",
  "enrolled_customers": [
    "<string>"
  ],
  "excluded_customers": [
    "<string>"
  ],
  "email_address": "<string>",
  "phone_number": "<string>",
  "scheduled_at": "<string>",
  "metadata": {},
  "attributed_revenue": 123
}'

{
  "id": "<string>",
  "name": "<string>",
  "enrolled_customers": [
    "<string>"
  ],
  "segment": "<string>",
  "steps": [
    {
      "type": "email",
      "custom_step_id": "<string>",
      "email_template_id": "<string>"
    }
  ],
  "email_address": "<string>",
  "phone_number": "<string>",
  "status": "draft",
  "scheduled_at": "<string>",
  "statistics": {
    "total_customers_enrolled": 123,
    "total_customers_started": 123,
    "total_customers_finished": 123
  },
  "consumed_message_segments": {
    "sms": 123,
    "mms": 123,
    "email": 123
  },
  "estimated_message_segments": {
    "sms": 123,
    "mms": 123,
    "email": 123
  },
  "attributed_revenue": 123
}