Hi Rajat,
Thanks for reaching out to the Google Ads API Forum.
With regard to your concern, you can follow the guidelines of Method:
customers.userLists.mutate for creating or updating user lists.
You may also see UserList reference, UserList report and Customer Match for
additional informatio
How can we upload userList thru google api?
Currently i m using this for mutating CustomerList for audience.
https://googleads.googleapis.com/v12/customers/323232323/userLists:mutate
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