Could you send the ad group ID and ad ID for your AdGroupAd? I'd like to see which type of
Ad (TextAd, TemplateAd, ProductAd, etc.) it is. For example, if it's a
TemplateAd, then there's not much that AdWords can return for
Headline and
PromotionLine since those are not attributes of that ad type -- they are attributes of
TextAds and
ProductAds, respectively.
If you need the button text of a
TemplateAd then currently the only option is to retrieve the ad via
AdGroupAdService and pull that information from the
TemplateAd's
templateElements.