toJson method
Implementation
@override
Map<String, dynamic> toJson() {
return {
'type': type,
'payload': {
if (name != null) 'name': name,
if (contactId != null) 'contact_id': contactId,
if (vcfInfo != null) 'vcf_info': vcfInfo,
if (vcfPhone != null) 'vcf_phone': vcfPhone,
},
};
}