public void Get_SuccessfullyGetAttachment()
{
// Act
var data = _attachmentClient.Get(DocumentId, AttachmentDocumentType.IssuedInvoice).AssertResult();
// Assert
var first = data.FirstOrDefault();
Assert.NotNull(first);
Assert.NotNull(first.FileBytes);
Assert.AreEqual(FileName, first.FileName);
}