Get a dlvr_et email identity token for each email, to store on your email platform's contacts. These are the same tokens the CSV upload on the Email pixel page returns. Send up to 10,000 emails per request; the tokens come back in the same order. Each call makes new tokens, valid for 365 days. An address that is not a valid email comes back with status invalid_email and no token.
Name the project with a project_id field; tokens only identify recipients on that project's pixels, and the project must belong to the key's organization. The organization needs email identity enabled (403 otherwise). Test API keys are not supported (403), since a token is real wherever it is issued. Not billed.
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Missing, malformed, or rejected API key (refused by the gateway, body {"error": "..."}), or the project belongs to another organization, or a project-bound key named a different project (the Error envelope).
Rate limited. Wait and retry with backoff.