# How-to Guides

## Assigning Rate Cards

Rate cards must be assigned to ensure customers are billed correctly.

**Usage Rate Cards:**

Use `POST /usage-rate-card-assignments` to assign usage-based pricing.

**Rental Rate Cards:**

Use `POST /rental-rate-card-assignments` to assign rental pricing.

**Example - Assigning a Rental Rate Card:**


```json
{
  "rentalProductInventoryId": 123,
  "rentalRateCardId": 456,
  "effectiveDate": "2026-01-01"
}
```