toMap method
Implementation
Map<String, dynamic> toMap() => {
'items': purchaseItems.map((item) => item.toMap()).toList(),
if (purchaseAdjustments != null) 'adjustments': purchaseAdjustments?.map((adjustment) => adjustment.toMap()).toList(),
if (messageId != null) 'message_id': messageId,
if (vars != null) 'vars': vars,
};