# MerchantBillingPricingStrategy

A model the API reference uses in a request or a response. The operation pages link every field typed as this model here.

Defines how a price plan rate entry calculates charges for a given SKU.

## Values

| Value | Description |
| --- | --- |
| `Fixed` | A fixed amount per billing period regardless of usage quantity. |
| `PerUnit` | A per-unit rate multiplied by the usage quantity. |
| `Tiered` | Per-unit rates that vary by quantity brackets (tiers). |
| `FixedPlusPercentage` | A fixed base amount plus a percentage of the transaction amount or volume. |

## See also

- [All documentation](https://devportal.demo.winkpg.io/llms.txt): the machine-readable index of every public page on this site.