toJson method
Implementation
Map<String, dynamic> toJson() => {
"id": id,
"rate_code": rateCode,
"rate_id": rateId,
"label": label,
"compound": compound,
"tax_total": taxTotal,
"shipping_tax_total": shippingTaxTotal,
"meta_data": List<dynamic>.from(metaData!.map((x) => x)),
};