Get Google Ads campaign metrics

<Info>This API is in beta. Endpoints, fields, and behavior may still change, so avoid depending on it in production.</Info>

Reads live performance figures for every campaign on the account over a date window, in one call.

This goes to Google directly rather than to Base44's nightly copy, so the numbers include today. Use it to fill in a table you first drew from List campaigns with include_metrics=false.

metrics is keyed by the Google Ads campaign ID, not Base44's campaign ID. Join on the google_campaign_id field from the list endpoint. A campaign that had no activity in the window does not appear as a zero row, it is simply absent.

When Google cannot be reached you get an empty metrics map with degraded set to true, under a 200. Treat that as "unknown" rather than "nothing happened".

<Note>start_date and end_date are inclusive and must both be YYYY-MM-DD. Anything else is rejected with a 400.</Note>

<Note>This endpoint accepts a personal API key. Workspace API keys are not authorized for it and are rejected with a 403.</Note>

{
  "metrics": {
    "21458812345": {
      "clicks": 137,
      "conversions": 6,
      "cost_micros": 48200000,
      "ctr": 0.028,
      "impressions": 4821
    }
  }
}