To use facematch(re-verification) identityId

For example to add identityId use the code snippet below:

MetaMap.shared.showMetaMapFlow(clientId: "YOUR_CLIENT_ID",
				flowId: "YOUR_FLOW_ID",
				metadata: ["identityId": "value"])
MetaMap.shared.showMetaMapFlow(clientId: "YOUR_CLIENT_ID",
				flowId: "YOUR_FLOW_ID",
				metadata: ["identityId": "value"])
[MetaMap.shared showMetaMapFlowWithClientId:@"YOUR_CLIENT_ID" 
			flowId:@"YOUR_FLOW_ID"  
			metadata:@{@"identityId":@"value"}];

Learn more about Facematch feature here.