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# Bill customers

Tabs supports multiple billing models — flat-rate, usage-based, seat-based, and other custom solutions.
This section covers how to configure contracts and billing terms, generate invoices, and handle advanced billing scenarios through the API.

#### [Generate invoices](/bill-customers/flat-rate)

Define billing terms, process a contract, and send an invoice to your customer

#### [Create usage-based billing](/bill-customers/usage-based)

Ingest usage events and generate invoices based on what your customers actually consume

#### [Configure custom billing solutions](/bill-customers/custom)

Adjust how and when invoices are generated