Send ntfy messages for Firefly transactions

I want to get an alert whenever a new transaction is added to Firefly.
This will be particularly helpful now that _xactmon_ is creating
transactions automatically based on notifications from Commerce, Chase,
etc.

dch_webhooks.py

@@ -146,9 +146,13 @@ class Firefly(HttpxClientMixin):
         rbody = r.json()
         attachment = rbody['data']
         url = f'{FIREFLY_URL}/api/v1/attachments/{attachment["id"]}/upload'
-        r = await self.client.post(url, content=doc, headers={
+        r = await self.client.post(
-            'Content-Type': 'application/octet-stream',
+            url,
-        })
+            content=doc,
+            headers={
+                'Content-Type': 'application/octet-stream',
+            },
+        )
         r.raise_for_status()
 
 
@@ -249,13 +253,25 @@ class Paperless(HttpxClientMixin):
                     MAX_DOCUMENT_SIZE,
                 )
                 continue
-            docs.append(
+            docs.append((response_filename(r), doc.title, await r.aread()))
-                (response_filename(r), doc.title, await r.aread())
-            )
         return docs
 
 
 async def handle_firefly_transaction(xact: FireflyIIITransaction) -> None:
+    try:
+        xact0 = xact.transactions[0]
+    except IndexError:
+        log.warning('Received empty transaction Firefly?')
+    else:
+        message = (
+            f'${xact0.amount} for {xact0.description} on {xact0.date.date()}'
+        )
+        title = f'Firefly III: New {xact.transactions[0].type.title()}'
+        tags = 'money_with_wings'
+        try:
+            await ntfy(message, 'firefly', title, tags)
+        except Exception:
+            log.exception('Failed to send notification')
     async with Firefly() as ff, Paperless() as pl:
         for split in xact.transactions:
             search = clean_description(split.description)