Revert "feat: build new api"

This reverts commit 069246e.

examples/simple_sender.rs

@@ -1,8 +1,11 @@
-// cargo run --example simple_sender -- -t <device_token>
-
 use argparse::{ArgumentParser, Store};
-use fcm::{fcm_options::FcmOptions, target::Target, Client, Message, Notification};
-use serde_json::json;
+use fcm::{Client, MessageBuilder, Target};
+use serde::Serialize;
+
+#[derive(Serialize)]
+struct CustomData {
+    message: &'static str,
+}
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
@@ -19,28 +22,12 @@ async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
     }
 
     let client = Client::new();
+    let data = CustomData { message: "howdy" };
+
+    let mut builder = MessageBuilder::new(Target::Token(device_token));
+    builder.data(&data)?;
 
-    let data = json!({
-        "key": "value",
-    });
-
-    let builder = Message {
-        data: Some(data),
-        notification: Some(Notification {
-            title: Some("Hello".to_string()),
-            body: Some(format!("it's {}", chrono::Utc::now())),
-            image: None,
-        }),
-        target: Target::Token(device_token),
-        android: None,
-        webpush: None,
-        apns: None,
-        fcm_options: Some(FcmOptions {
-            analytics_label: "analytics_label".to_string(),
-        }),
-    };
-
-    let response = client.send(builder).await?;
+    let response = client.send(builder.finalize()).await?;
     println!("Sent: {:?}", response);
 
     Ok(())