Hi,
My apologies as I was not able to check that the AdGroupBidModifierService
<https://developers.google.com/adwords/api/docs/reference/v201710/AdGroupBidModifierService>
is
for Platform and PreferredContent criteria only. So you can update the
bidModifier
<https://developers.google.com/adwords/api/docs/reference/v201710/AdGroupCriterionService.BiddableAdGroupCriterion#bidmodifier>
for
the placement criterion, you can use the AdGroupCriterionService.mutate()
<https://developers.google.com/adwords/api/docs/reference/v201710/AdGroupCriterionService#mutate>
with
SET operator. However, aside from the id
<https://developers.google.com/adwords/api/docs/reference/v201710/AdGroupCriterionService.Placement#id>
of
the placement criterion, you also need to set the adGroupId
<https://developers.google.com/adwords/api/docs/reference/v201710/AdGroupCriterionService.BiddableAdGroupCriterion#adgroupid>
in
your request. Below is a sample SOAP request snippet that you can emulate:
<soapenv:Body>
<mutate xmlns="https://adwords.google.com/api/adwords/cm/v201710";>
<operations>
<operator>SET</operator>
<operand xmlns:ns2=
"https://adwords.google.com/api/adwords/cm/v201710"; xsi:type=
"ns2:BiddableAdGroupCriterion">
<ns2:adGroupId>XXXXXXXXXXXXXX</ns2:adGroupId>
<ns2:criterion xsi:type="ns2:Placement">
<ns2:id>XXXXXXXXXXXXXX</ns2:id>
</ns2:criterion>
<ns2:bidModifier>2.4</ns2:bidModifier>
</operand>
</operations>
</mutate>
</soapenv:Body>
Let me know if this helps.
Thanks,
Vincent
AdWords API Team
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