Create ChatGPT Ads Ad Group

Creates an ad group under a ChatGPT Ads campaign and sets its maximum bid and context hints.

`max_bid` is the most you will pay for one click (or one thousand impressions when `billing_event` is `impression`), in the account currency. It is checked against two rules: a bid can never exceed the campaign's own daily budget (one click cannot consume the whole day), and a sanity ceiling catches a decimal slip like 3500 for 3.5. A deliberate high bid passes with `allow_high_bid=true`. `context_hints` decides which ChatGPT conversations the ads can match: short natural sentences describing the product, the use case or the need, in the language your buyers actually chat in, up to 2000 of them. They are not exact-match keywords and they do not replace country or platform targeting. Created paused unless `activate=true`. confirm=false returns a dry run.