List every BillingServ billing API endpoint available through this server, with descriptions and required parameters. Read endpoints cover customers, invoices, payments, orders, packages, discounts, support tickets, usage meters, settings, and sales/revenue reports. Write endpoints cover creating and updating tickets, orders, customers, invoices, quotes, discounts, packages, package groups, and package options, and sending invoices and payment reminders.

Fetch live billing data from the BillingServ API: customers, invoices (including unpaid and overdue), payment methods, transactions, orders, subscriptions, packages, discounts, usage meters, tax and staff settings, and sales/revenue reports. Use this for any question about billing, invoices, customers, orders, or revenue. Only allowlisted endpoints can be called.

Create or update records in BillingServ: support tickets and ticket replies, orders, customers, customer notes, invoices, quotes, discounts, packages, package groups, and package options. Can also send an invoice or payment reminder to a customer by email. This tool changes real billing data and can email customers, so confirm the details with the user before calling it. Only allowlisted endpoints can be called; deleting records and capturing payments are not available through this server.