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# NEFlowMetaData

Additional information about data flowing through a per-app VPN provider.

```
class NEFlowMetaData
```

## Overview

This metadata is only present for data flowing through per-app VPN providers, that is, app proxy providers and packet tunnel providers in per-app VPN mode, as indicated by the [`routingMethod`](/documentation/NetworkExtension/NETunnelProvider/routingMethod) property.

## Topics

### Getting source app information

[`sourceAppUniqueIdentifier`](/documentation/NetworkExtension/NEFlowMetaData/sourceAppUniqueIdentifier)

A data instance that contains a unique hash value for the source application.

[`sourceAppSigningIdentifier`](/documentation/NetworkExtension/NEFlowMetaData/sourceAppSigningIdentifier)

A string that contains the signing identifier of the source application.

[`sourceAppAuditToken`](/documentation/NetworkExtension/NEFlowMetaData/sourceAppAuditToken)

The audit token of the source application of the flow.

### Getting flow information

[`filterFlowIdentifier`](/documentation/NetworkExtension/NEFlowMetaData/filterFlowIdentifier)

The identifier of the content filter flow corresponding to this flow.

## See Also

[`NEPacket`](/documentation/NetworkExtension/NEPacket)

A network packet and its associated properties.

## Relationships

### Conforms To

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`Equatable`](/documentation/Swift/Equatable)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`NSCoding`](/documentation/Foundation/NSCoding)

[`CVarArg`](/documentation/Swift/CVarArg)

[`Hashable`](/documentation/Swift/Hashable)

[`NSCopying`](/documentation/Foundation/NSCopying)

[`NSSecureCoding`](/documentation/Foundation/NSSecureCoding)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

---

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