toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (billingDetails != null) 'billingDetails': billingDetails!,
if (merchantId != null) 'merchantId': merchantId!,
if (storeName != null) 'storeName': storeName!,
if (storeUrl != null) 'storeUrl': storeUrl!,
};