Retrieve global limits for all customer's clients

curl --request GET \
  --url https://api.pingnetwork.io/customer/v2/customer/limits/global \
  --header 'Authorization: <api-key>'

{
  "id": "gl_123456789",
  "created_at": "2025-02-28T14:30:00.000Z",
  "updated_at": "2025-02-28T14:30:00.000Z",
  "downloaded_bytes": 1099511627776,
  "uploaded_bytes": 1099511627776,
  "download_speed": 104857600,
  "upload_speed": 104857600
}