On 
August 15, 2018, creating 
TemplateAds with IDs 
464 (Gmail single promotion template), 
466 (Gmail multi-product template), and 497 (Gmail multi-call-to-action template) will result in the error: 
AdError.Reason.USER_DOES_NOT_HAVE_ACCESS_TO_TEMPLATE. These template ads are now considered deprecated, but existing template ads with these IDs will continue to serve after this date.
If you would like to create a Gmail ad, use the new 
GmailAd introduced in 
v201802. Use this new entity instead of the deprecated Gmail template ads going forward.
Here are some tips to ease the transition:
  - Create new GmailAdsin a paused campaign with the AdvertisingChannelType asDISPLAYand the AdvertisingChannelSubType asDISPLAY_GMAIL_AD.
- Use MediaService to upload images or retrieve existing media IDs.
- Enable the new campaign when the ads are ready, letting it run in parallel with the Gmail template ad campaign.
- Pause and remove the Gmail template ad campaign when you’re comfortable with the new Gmail campaign.
For an implementation example, see the 
Add a Gmail ad to an ad group sample in any of our supported client libraries: 
Java, 
PHP, 
Python, 
Ruby, 
Perl, 
C#, and 
VB.NET.
If you have questions while you’re upgrading, please reach out to us on the 
AdWords API forum.
 Nadine Sundquist, AdWords API Team
 Nadine Sundquist, AdWords API Team