Create the campaign and budget resources first, then prepare a single bulk mutate request containing the AssetGroup plus every AssetGroupAsset link.
Include the minimum required text assets: at least 3 headlines (max 30 chars each), 1 long headline (max 90 chars), at least 3 descriptions (max 90 chars each), and 1 business name.
Include at least 1 landscape image (1.91:1) and 1 square image (1:1) linked as MARKETING_IMAGE and SQUARE_MARKETING_IMAGE asset field types respectively, plus at least 1 logo image.
If brand guidelines are enabled on the campaign, attach BUSINESS_NAME, LANDSCAPE_LOGO, and LOGO assets as CampaignAsset objects rather than AssetGroupAsset objects.
Submit the entire AssetGroup + AssetGroupAsset set in one GoogleAdsService.MutateAsync call; the API will reject the request if the asset group and its minimum assets are not created together.
Check the partial_failure_error field in the response and inspect asset_group_asset errors separately, as asset validation errors surface there rather than at the top-level campaign error.
Known gotchas
For non-retail Performance Max, the asset group and all linked minimum assets must be in the same mutate request; splitting them across two calls will cause a validation error even if the asset group itself was saved.
The minimum is 3 headlines, 1 long headline, 3 descriptions, 1 business name, 1 landscape image, 1 square image, and 1 logo — not 1 headline or 1 description as some older documentation suggests.
Video assets are not in the minimum set for non-retail campaigns; if no video is supplied, Google auto-generates one from your images, which may not match brand guidelines.
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