Create the template for the Flask framework

app/routes/customer.py

@@ -0,0 +1,11 @@
+from flask import Blueprint, render_template
+from flask_login import login_required, current_user
+from app.models import Customer
+
+customer_bp = Blueprint('customer', __name__, url_prefix='/customers')
+
+@customer_bp.route('/portal')
+@login_required
+def portal():
+    customer = Customer.query.filter_by(user_id=current_user.id).first_or_404()
+    return render_template('customers/portal.html', customer=customer)