Find the OpenAI Conversions API key
Go to your OpenAI Ads Manager account, then open the Conversions tab.
In the Conversions API section, generate an API key. This key is tied to your pixel and starts with sk-svcacct-.
The key is displayed only once, at creation time. Copy it immediately and store it somewhere safe. Never place it in your GTM Web container: it must stay server-side.
Being unable to generate the key may be due to insufficient permissions on the ad account.
Copy the key and paste it into the Conversions API Key field of the Addingwell OpenAI CAPI tag.