Fix import layout to satisfy isort CI config

Author: hollyabrams

official/guides/embeddables-guide/server.py

@@ -1,15 +1,16 @@
 import os
 import requests
 from flask import Flask, jsonify
-
 app = Flask(__name__)
-
 EASYPOST_API_KEY = os.environ.get("EASYPOST_API_KEY", "")
 
 
 @app.route("/api/easypost-embeddables/session", methods=["GET"])
 def create_embeddable_session():
-    payload = {"user_id": "SUB_ACCOUNT_USER_ID", "origin_host": "ORIGIN_HOST"}
+    payload = {
+        "user_id": "SUB_ACCOUNT_USER_ID",  # Replace with sub-account user ID
+        "origin_host": "ORIGIN_HOST",  # Replace with integrator's domain
+    }
 
     response = requests.post(
         "https://api.easypost.com/v2/embeddables/session",
@@ -18,7 +19,6 @@ def create_embeddable_session():
         headers={"Content-Type": "application/json"},
         timeout=10,
     )
-
     response.raise_for_status()
     return jsonify(response.json())