TierRate.fromJson constructor
      
      TierRate.fromJson(
    
    
- Map json_
 
Implementation
TierRate.fromJson(core.Map json_)
  : this(
      startUsageAmount: (json_['startUsageAmount'] as core.num?)?.toDouble(),
      unitPrice:
          json_.containsKey('unitPrice')
              ? Money.fromJson(
                json_['unitPrice'] as core.Map<core.String, core.dynamic>,
              )
              : null,
    );