curl --request POST \
  --url http://localhost:8000/api/v1/subscriptions/customers/bulk \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '[
  123
]'

[
  {
    "google_ads_customer_id": 123,
    "subscriptions": [
      {
        "google_ads_customer_id": 123,
        "subscription_plan_id": 123,
        "starts_at": "2023-11-07T05:31:56Z",
        "expires_at": "2023-11-07T05:31:56Z",
        "id": 123,
        "date_added": "2023-11-07T05:31:56Z",
        "date_updated": "2023-11-07T05:31:56Z",
        "subscription_plan": {
          "name": "<string>",
          "price": "<string>",
          "id": 123,
          "date_added": "2023-11-07T05:31:56Z",
          "date_updated": "2023-11-07T05:31:56Z",
          "image_url": "<string>",
          "modules": [
            {
              "constraint": 123,
              "analysis_frequency_hours": 123,
              "id": 123,
              "date_added": "2023-11-07T05:31:56Z",
              "date_updated": "2023-11-07T05:31:56Z",
              "is_autopilot_enabled": false
            }
          ]
        },
        "cancelled_at": "2023-11-07T05:31:56Z"
      }
    ]
  }
]