curl --request POST \
  --url https://api.clix.so/api/v1/messages:send \
  --header 'Content-Type: application/json' \
  --header 'X-Clix-API-Key: <api-key>' \
  --header 'X-Clix-Project-ID: <api-key>' \
  --data '
{
  "push_notifications": [
    {
      "target": {
        "project_user_id": "<string>"
      },
      "title": "<string>",
      "body": "<string>",
      "image_url": "<string>",
      "landing_url": "<string>"
    }
  ]
}
'

{
  "delivery_results": [
    {
      "message_id": "<string>",
      "additional_params": {
        "device_id": "<string>",
        "fcm_message_id": "<string>",
        "failure_reason": "<string>"
      }
    }
  ]
}