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If the username does not exist in the MyAlerts database you will need to call the DeleteUserLayerGroup method to add the user.

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The DeleteUserLayerGroup method needs the following parameters:

ClientId

This is the id for the client that was returned by the CreateSessionKey method.

SessionKey

This is the SessionKey for the client that was returned by the CreateSessionKey method.

UserId

This is the unique user id for the user as stored in the MyAlerts database.

LayerGroupId

This is the unique id for the LayerGroup that you wish to remove.

MapSourceId

This is the unique id for the LayerGroupMapSource.

LocationId

This is the unique id for the Location.

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<DeleteUserLayerGroupResult>
	<Error>
		<Code>string</Code>       
		<Description>string</Description>
    </Error>
	<Success>boolean</Success>
</DeleteUserLayerGroupResult>

Error- Code / Description

An error code and description if the call to the web service is unsuccessful and the Success if False.

1001 – Invalid Session key provided

Success

This will be either True or False. If False an error message will be provided in the Error result, if True the user will be un-subscribed from the layer group.