curl --request POST \
  --url https://api.heyy.io/api/v2.0/{channelId}/workflows/{workflowId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "phoneNumber": "<string>",
  "variables": [
    {
      "name": "<string>",
      "value": "<string>"
    }
  ],
  "scheduledAt": "2023-11-07T05:31:56Z"
}
'

{
  "data": {}
}