> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.paymentkit.com/guides/product-catalog/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.paymentkit.com/_mcp/server.

# Product Catalog

## Docs

- [Overview: Product catalog](https://docs.paymentkit.com/guides/product-catalog/overview.md): The product catalog is the foundation of your billing system. Define products, set up pricing models, and configure how customers are charged.
- [Flat pricing](https://docs.paymentkit.com/guides/product-catalog/pricing-models/flat.md): Charge customers a fixed amount regardless of quantity or usage.
- [Usage-based pricing](https://docs.paymentkit.com/guides/product-catalog/pricing-models/usage-based.md): Charge customers based on actual consumption by tracking usage events and billing at the end of each period.
- [Fixed pricing structure](https://docs.paymentkit.com/guides/product-catalog/pricing-structures/fixed.md): Charge a fixed price for each unit of a product or service.
- [Tiered pricing](https://docs.paymentkit.com/guides/product-catalog/pricing-structures/tiered.md): Charge different prices based on quantity thresholds using volume or graduated tiers.
- [Package pricing](https://docs.paymentkit.com/guides/product-catalog/pricing-structures/package.md): Charge a fixed price for a predefined group of units rather than per individual unit.
- [Packages](https://docs.paymentkit.com/guides/product-catalog/packages.md): Group multiple products together into a single purchasable option with combined pricing.
- [Upgrade paths](https://docs.paymentkit.com/guides/product-catalog/upgrade-paths.md): Control how customers move between products or plans and define allowed upgrade and downgrade behavior.
- [Change a price](https://docs.paymentkit.com/guides/product-catalog/change-a-price.md): Move a product and its existing subscriptions to a new price in one request, with a dry run to check the result first.
- [Discounts](https://docs.paymentkit.com/guides/product-catalog/discounts.md)