# Product predicate language

A product discount predicate evaluates an individual variant price record.
The same variant can have one matching EUR price and another non-matching price.
Optional channel, country, and customer-group dimensions belong to that price record, not to the shopper's current browser state.

## Supported fields

| Field | Value |
| --- | --- |
| `sku` | Variant SKU |
| `country_code` | Price country or null |
| `channel.id` | Price channel ID or null |
| `customer_group.id` | Price customer-group ID or null |
| `price.id` | Price ID |
| `price.amount` | Integer minor-unit amount |
| `price.currency` | Currency code |
| `product.id`, `product.name`, `product.slug` | Product identity and labels |
| `product.collections` | Collection entries with `id`, `name`, and `slug` |
| `variant.id`, `variant.name` | Variant identity and label |

Product tags, categories, and cart fields are not part of this context.
Use a supported collection, SKU, or identity condition instead.

## Target one SKU and currency


SKU and currency

```text
sku == "LAMP-BLACK" && price.currency == "EUR"

```


This affects eligible EUR price records for that SKU.
It does not automatically affect another currency or create a base price.

## Target a collection


Collection

```text
price.currency == "EUR" &&
product.collections.any(collection => collection.slug == "desk-refresh")

```


Use collection IDs for relationships that must survive slug changes.

## Narrow a price dimension


Price channel

```text
channel.id != null && channel.id == "<price-channel-id>" &&
price.currency == "EUR"

```


Replace the placeholder with an actual channel ID.
A rule requiring a channel ID does not also match a price with no channel dimension.
The same distinction applies to customer-group and country constraints.

## Verify timing and amounts

The base price's `validFrom` and `validTo` window and the discount's `validFrom` and `validUntil` window are separate.
Verify both when a scheduled reduction is missing.
Pair `price.amount` comparisons with a currency condition, and test the boundary in minor units.

Read [Product discounts](/concepts/discounts/product-discounts) for lifecycle and [Predicate language](/concepts/predicate-language) for shared syntax.