pacingType property
The type of pacing that defines how the budget amount will be spent across the pacing_period.
PACING_TYPE_ASAP is not compatible with pacing_period
PACING_PERIOD_FLIGHT for insertion orders.
Required. Possible string values are:
- "PACING_TYPE_UNSPECIFIED" : Pacing mode value is not specified or is unknown in this version.
 - "PACING_TYPE_AHEAD" : Only applicable to 
PACING_PERIOD_FLIGHTpacing period. Ahead pacing attempts to spend faster than evenly, to make sure the entire budget is spent by the end of the flight. - "PACING_TYPE_ASAP" : Spend all of pacing budget amount as quick as possible.
 - "PACING_TYPE_EVEN" : Spend a consistent budget amount every period of time.
 
Implementation
core.String? pacingType;