Hi,
Yes, you should be able to create 'CALLOUT' extension at AdGroup level. We
dont have a sample for this specific case, but you could refer to this
<https://github.com/googleads/googleads-java-lib/blob/master/examples/adwords_axis/src/main/java/adwords/axis/v201609/extensions/AddSiteLinks.java>
example
which is associating 'SITELINK' to a campaign. You will need to modify the
code to use AdGroupExtensionSettingServiceInterface
<https://developers.google.com/adwords/api/docs/reference/v201609/AdGroupExtensionSettingService>
instead.
Below is a sample SOAP request log:
<soapenv:Body>
<mutate xmlns="https://adwords.google.com/api/adwords/cm/v201609";>
<operations>
<operator>ADD</operator>
<operand>
<adGroupId>***</adGroupId>
<extensionType>CALLOUT</extensionType>
<extensionSetting>
<extensions
xmlns:ns2="https://adwords.google.com/api/adwords/cm/v201609";
xsi:type="ns2:CalloutFeedItem">
<ns2:calloutText>Free delivery</ns2:calloutText>
</extensions>
<extensions
xmlns:ns3="https://adwords.google.com/api/adwords/cm/v201609";
xsi:type="ns3:CalloutFeedItem">
<ns3:calloutText>Kids eat free</ns3:calloutText>
</extensions>
</extensionSetting>
</operand>
</operations>
</mutate>
</soapenv:Body>
Thanks,
Sreelakshmi, AdWords API Team
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