Hi there,
Thanks for reaching out to the Google Ads API Forum.
Kindly note that the REST API path of CustomerCustomizer v9 is POST https://googleads.googleapis.com/v9/customers/{customerId}/CustomerCustomizers:mutate. This is intended. You may check our REST documentation here.
With regards to the API path found in said GitHub code, you can use this supported client libraries to access Google Ads APIs. They are based on gRPC for better performance and provide an idiomatic client surface for better developer experience.
Let us know if you have any further questions.
Regards,
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