Glossary

• SLA: Service Level Agreement (guaranteed response or resolution times)
• ONT: Optical Network Terminal (customer premises equipment for fibre)
• UPRN: Unique Property Reference Number (UK address identifier)
• KCI: Keep Customer Informed (order status updates)
• API: Application Programming Interface
• Order Flow: The process of submitting and managing orders
• mTLS: Mutual Transport Layer Security (certificate-based authentication)
• DTO: Data Transfer Object (request/response schema)
• Webhook: HTTP callback for event notifications
• Tenant: The organization or customer using the API
• Service Specification: The type of service being ordered (e.g., FTTP)
• Appointment Purpose: The reason for an appointment (e.g., PROVIDE, REPAIR)