Template Syntax & Naming

{{variable_name}}

"Hello {{customer_name}}, your appointment is at {{appointment_time}}"
"Your order #{{order_id}} will arrive on {{delivery_date}}"

{user_input}           ❌ Single braces
{{User Input}}         ❌ Spaces
{{user-input}}         ❌ Hyphens
{{userInput}}          ❌ camelCase not allowed
{{ user_input }}       ❌ Spaces inside braces

customer_name          ✅
appointment_date_1     ✅
user_phone_number      ✅
api_response_data      ✅
is_premium_user        ✅

customerName           ❌ camelCase
Customer_Name          ❌ Capital letters
customer-name          ❌ Hyphens
customer name          ❌ Spaces
123_customer           ❌ Starts with number
_customer_name         ❌ Starts with underscore
customer_name!         ❌ Special characters

{% if direction == "outbound" %}
Hi {{customer_name}}, I'm calling from Acme Corporation.
{% else %}
Thanks for calling! How can I help you today?
{% endif %}

Your balance is {{balance | default("unavailable")}}.