Features
New promotion rules: time-bound promotions and payment method promotions.
Stripe Billing for Orders: added Stripe Billing integration for orders.
Shipping discount via percentage: shipping discounts now use a percentage calculator.
Line item promotion action: added a line-item-level promotion action type.
Channel ID on orders: added support for channel ID on orders.
AWS IoT MQTT support: added AWS IoT MQTT support.
Dashboard polish: chart values on the dashboard are now formatted.
User ID in audit log: the audit log now records the user ID for change tracking.
Chores
Email templates: added shipment_cost and full_address fields for use in email templates.
Performance: added a strong ETag to the store product endpoint.
