docs: txhash notification example

packages/notification/Readme.md

@@ -6,7 +6,9 @@ These functions are meant to help you easily create notification channels for pr
 
 ### Implementing a `NotificationData` struct
 
-Each notification channel will have a specified data format, which is defined by creating a struct that implements the `NotificationData` trait, which has two methods: `to_cbor` and `channel_id`. The following example illustrates how you might implement this for a channel called `my_channel` and notification data containing two fields: `message` and `amount`.
+Each notification channel will have a specified data format, which is defined by creating a struct that implements the `NotificationData` trait, which has two methods: `to_cbor` and `channel_id`. 
+
+The following example illustrates how you might implement this for a channel called `my_channel` and notification data containing two fields: `message` and `amount`.
 
 ```rust
 #[derive(Serialize, Debug, Deserialize, Clone)]
@@ -36,25 +38,28 @@ The `api` parameter for `to_cbor` is not used in this example, but is there for
 
 ### Sending a TxHash notification
 
-To send a notification to a recipient you then create a new `Notification` passing in the address of the recipient along with the notification data you want to send. The following creates a notification for the above `my_channel` and adds it to the contract `Response` as a plaintext attribute.
+To send a notification to a recipient you first create a new `Notification` struct passing in the address of the recipient along with the notification data you want to send. Then to turn it into a `TxHashNotification` execute the `to_txhash_notification` method on the `Notification` by passing in `deps.api`, `env`, and an internal `secret`, which is a randomly generated byte slice that has been stored previously in your contract during initialization.
+
+The following code snippet creates a notification for the above `my_channel` and adds it to the contract `Response` as a plaintext attribute.
 
 ```rust
-let note = Notification::new(
+let notification = Notification::new(
     recipient,
     MyNotificationData {
         "hello".to_string(),
         1000_u128,
     }
-);
+)
+.to_txhash_notification(deps.api, &env, secret)?;
 
 // ... other code
 
 // add notification to response
 Ok(Response::new()
     .set_data(to_binary(&ExecuteAnswer::MyMessage { status: Success } )?)
     .add_attribute_plaintext(
-        note.id_plaintext(),
-        note.data_plaintext(),
+        notification.id_plaintext(),
+        notification.data_plaintext(),
     )
 )
 ```