AI-generated Key Takeaways
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          DeliveryRateType dictates how line items are served, with options for even distribution, frontloaded delivery, or as fast as possible. 
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          EVENLYdistributes line items as evenly as possible across the specified duration.
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          FRONTLOADEDserves line items more aggressively at the beginning of the flight date.
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          AS_FAST_AS_POSSIBLEprioritizes rapid delivery, potentially stopping lower-priority line items until the booked impressions or clicks are met.
Possible delivery rates for a LineItem, which dictate the manner in which they are served.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202505
| Enumeration | Description | 
|---|---|
| EVENLY | Line items are served as evenly as possible across the number of days specified in a line item's LineItem.duration. | 
| FRONTLOADED | Line items are served more aggressively in the beginning of the flight date. | 
| AS_FAST_AS_POSSIBLE | The booked impressions for a line item may be delivered well before the LineItem.endDateTime. Other lower-priority or lower-value line items will be stopped from delivering until this line item meets the number of impressions or clicks it is booked for. |