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# PricingModel

The unit of ad delivery that determines billing for an ad group, independent of how the account funds spend.

```
string PricingModel
```

## Discussion

The `PricingModel` controls which event triggers billing for an ad group’s delivery: a tap, an impression, or an install action. You set it on `AdGroup` or `AdGroupCreate`, and it must match the parent campaign’s `billingEvent`.

The `PricingModel` is distinct from `PaymentModel`. The `PricingModel` (`CPA`, `CPM`, or `CPT`) determines the delivery unit that triggers billing for an ad group. The `PaymentModel` (`PAYG` or `LOC`) determines how the advertiser’s account funds that spend, pay-as-you-go billing versus a line of credit. The two are unrelated enums on unrelated resources. Don’t use one where the documentation calls for the other.

---

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