Delete or reject a users pending group request. 

This method can be accessed through the CommunityGroup.asmx file located in:

~/Workarea/webservices/WebServiceAPI/Community/CommunityGroup.asmx

[SoapHeader("AuthHeader")]
[SoapHeader("RequestInfoHeader")]
[WebMethod(MessageName = "DeletePendingGroupUser", Description = "Delete or reject a users pending group request.")]
public void DeletePendingGroupUser(long userId, long groupId);

<SoapHeader("AuthHeader")>
<SoapHeader("RequestInfoHeader")>
<WebMethod(MessageName = "DeletePendingGroupUser", Description = "Delete or reject a users pending group request.")>
Public Function DeletePendingGroupUser(userId As long, groupId As long) As void