Hi Agusti, The clientCustomerId is the customer ID of your target AdWords account which is usually, in the form of 123-456-7890. According to this guide <https://developers.google.com/adwords/api/docs/guides/call-structure#request_headers>, the clientCustomerId is required for all requests except CustomerService and ReportDefinitionService (specifically if you are running the reports in parallel).
There's a possibility that your calls succeeded without clientCustomerId when you were using the said two services. However, with the other API services, it will always return that specific error if you'll not specify a clientCustomerId. Our recommended approach is to set the clientCustomerId and other OAuth2 credentials in the property file <https://github.com/googleads/googleads-java-lib/blob/master/examples/adwords_axis/src/main/resources/ads.properties>. This way, you don't have to set these fields in your code just like this example <https://github.com/googleads/googleads-java-lib/blob/master/examples/adwords_axis/src/main/java/adwords/axis/v201710/basicoperations/GetCampaigns.java> specifically on this line <https://github.com/googleads/googleads-java-lib/blob/master/examples/adwords_axis/src/main/java/adwords/axis/v201710/basicoperations/GetCampaigns.java#L42> . Thanks, Vincent AdWords API Team -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog and Google+: https://googleadsdeveloper.blogspot.com/ https://plus.google.com/+GoogleAdsDevelopers/posts =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ You received this message because you are subscribed to the Google Groups "AdWords API Forum" group. To post to this group, send email to adwords-api@googlegroups.com To unsubscribe from this group, send email to adwords-api+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/adwords-api?hl=en --- You received this message because you are subscribed to the Google Groups "AdWords API Forum" group. To unsubscribe from this group and stop receiving emails from it, send an email to adwords-api+unsubscr...@googlegroups.com. Visit this group at https://groups.google.com/group/adwords-api. To view this discussion on the web visit https://groups.google.com/d/msgid/adwords-api/0c492e92-8fc5-4d0b-b481-0118a9e75a83%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
