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

Writes ad copy for the app and returns it as previews.

Nothing reaches Google Ads here. Each line comes back with a session_asset_id you pass to Accept a generated Google Ads asset to put it on a live campaign. Use Generate Google Ads assets instead when you want copy and pictures in one call.

Pick the lines you want with asset_field_types. SEARCH campaigns do not take LONG_HEADLINE, so Google rejects that combination.

Grounding is flexible here, unlike image generation. You may send final_url and freeform_prompt together, and sending neither grounds the copy in the app's own home page.

The copy is written in language_code when you send it, then in the campaign's language when you send campaign_id, and otherwise in the language of the app's own site. The response reports which one in language.

<Note>Only one generation of each kind runs per app at a time. Calling this while one is running returns a 200 carrying in_flight set to true, that run's session_id, and an empty assets. Poll the session_id you were given rather than retrying.</Note>

This endpoint costs 2 of 20 copy requests a minute per app, shared with the other Google Ads endpoints that write copy, and up to 4 when the retry below happens.

<Note>When Google refuses the page you pointed at, Base44 retries once on the app's own published URL, and that retry costs the same again. Pace requests against the doubled figure, not the single one, or a refusal-heavy app hits a 429 part-way through its own recovery.</Note>

<Note>Generating creative does not spend credits and is not billed. It is capped by rate limits instead, so a burst gets a 429 rather than a bill.</Note>

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

<Warning>The response includes fields beyond the ones documented here. Don't rely on undocumented response fields, as they can change at any time. Send only the fields documented here. Other request fields are not supported and their behavior can change.</Warning>

{
  "channel_type": "PERFORMANCE_MAX",
  "asset_field_types": [
    "HEADLINE",
    "DESCRIPTION"
  ],
  "final_url": "https://example.com/spring",
  "freeform_prompt": "Lead with free delivery across Germany",
  "keywords": [
    "oak furniture",
    "handmade table"
  ],
  "language_code": "de",
  "campaign_id": "6886b8d390dc7e2f4a2c91b3",
  "single_asset": true,
  "session_id": "3f9c2a7b8d1e4f6a9b0c1d2e3f4a5b6c"
}

{
  "session_id": "9c1d2e3f-4a5b-6c7d-8e9f-0a1b2c3d4e5f",
  "assets": [],
  "language": "de",
  "in_flight": true
}