toJson method
Converts the object to a JSON representation.
Implementation
@override
Map<String, dynamic> toJson() {
return {
"locking_chain_door": lockingChainDoor,
"locking_chain_issue": lockingChainIssue.toJson(),
"issuing_chain_door": issuingChainDoor,
"issuing_chain_issue": issuingChainIssue.toJson()
};
}