use std::error::Error; #[tokio::main] async fn main() -> Result<(), Box> { let session_key: String = std::env::var("ZIPWHIP_SESSION_KEY")?; let zw_client = zipwhip_rs::Client::with_key(session_key); zw_client .bulk_sms( vec!["+1206000000", "+1206000001", "+1206000002"], "Hello, bulk_sms", ) .await; Ok(()) }