Hi Elis,
Thank you for reaching out to Google Ads/AdWords API support. Your link is to an API migration guide from AdWords to Ads. If you already have the code to create and populate a user list then you can just take the populate user list code by itself and feed that code a pre existing user list. Here's our
Customer Match Guide. Feel free to get back to us.
Regards,
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| Aryeh |
| Google Ads API Team |
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