toJson method
Implementation
Map<String, dynamic> toJson() => {
'product_id': product_id,
'quantity': quantity,
'variant_id': variant_id,
'print_provider_id': print_provider_id,
'cost': cost,
'shipping_cost': shipping_cost,
'status': status,
'sent_to_production_at': sent_to_production_at,
'fulfilled_at': fulfilled_at,
'metadata': metadata,
};