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API representation of a price rule.
One of: BuyXGetYFree, BuyXGetYPercentOff, SpendThreshold, QuantityTier.
One of: GroupCode, Global.
One of: BestWins, Stack, or null to inherit the tenant setting.
Typed parameters for a price rule; relevant fields depend on RuleType.
Customer-tag ids that gate this rule. Empty = applies to any client; when non-empty the rule fires only for clients carrying at least one of them.