Retrieve a document and signature

I’m currently successfully sending and retrieving documents. 

What I need to do is retrieve the document and its signature. 

How would I do that?

Here’s what I currently have coded:

 Function GetPageImagesAPI(strEnvelopeID As String) As Byte()
        Try
            Dim oApiClient As ApiClient = NewConfigureApiClient()
            Dim oEnvelopesApi As EnvelopesApi = New EnvelopesApi(oApiClient)

            Dim ms As MemoryStream = oEnvelopesApi.GetDocumentPageImage(mcreds.accountId, strEnvelopeID, 1, 1)
            Dim b As Byte() = ms.ToArray
            Return b

        Catch ex As ApiException
            Throw ex
        Catch ex As Exception
            Throw ex
        End Try
    End Function