Helo.configure do |config|
  config.access_token = "YOUR_BEARER_TOKEN"
end

opts = {
  channel_id: "550e8400-e29b-41d4-a716-446655440000",
  from: "2024-01-01T00:00:00Z",
  to: "2024-01-01T00:00:00Z",
  tags: ["example1", "example2"]
}
Helo::Statistics.retrieve_totals(opts)

{
  "transactional": {
    "sent": 123,
    "delivered": 123,
    "opened": 123,
    "clicked": 123,
    "bounced": 123,
    "unsubscribed": 123,
    "complained": 123
  },
  "broadcast": {
    "sent": 123,
    "delivered": 123,
    "opened": 123,
    "clicked": 123,
    "bounced": 123,
    "unsubscribed": 123,
    "complained": 123
  }
}