Update a campaign

Changes a campaign's settings, such as its name, budget, bidding or tracking URLs.

Send at least one of budget, bidStrategy, portfolioBidStrategyId, targetImpressionShare, manualCpc, networkSettings, trackingUrlTemplate, finalUrlSuffix, sharedBudgetId, name or platformSpecificData. An unsupported field is always an error, never a silent drop.

Meta budget edits check the live campaign budget, so an older local ABO stamp cannot block a CBO campaign. A successful edit repairs local ad budget fields. A live ABO campaign still returns 409 with the ad-set budget endpoint.

On Google: LOWEST_COST_WITHOUT_CAP = Maximize Conversions, COST_CAP + bidAmount = Target CPA, LOWEST_COST_WITH_MIN_ROAS + roasAverageFloor = Target ROAS, LOWEST_COST_WITH_BID_CAP + bidAmount = Maximize Clicks with a CPC ceiling; portfolioBidStrategyId attaches a portfolio strategy instead (exclusive with bidStrategy). targetImpressionShare switches the campaign to Target impression share and manualCpc: { maxCpc } to Manual CPC (every ad group of the campaign gets maxCpc as its bid, in the same mutate); each is exclusive with every other strategy field. networkSettings, trackingUrlTemplate and finalUrlSuffix go out in one campaign update, each field sent written on its own leaf, so an omitted one keeps its current value; an empty string clears a URL field. Setting the standard triplet on a campaign that is currently on a PORTFOLIO strategy is rejected: detach it in Google Ads first, since it is shared across campaigns.

Google budget updates read the current budget before mutation. Shared budgets return 409 unless allowSharedBudgetUpdate=true is explicitly supplied, because the change affects every campaign using that budget. A budget counts as shared when Google flags it as shared or when more than one campaign uses it (older budgets can serve several campaigns without the flag). Unknown sharing state also returns 409.

sharedBudgetId (Google) moves the campaign onto a shared budget from GET /v1/ads/shared-budgets, which also needs allowSharedBudgetUpdate: true (409 otherwise) because the campaign then splits that budget with every campaign on it; budget cannot ride along. sharedBudgetId: null moves it back onto a new budget of its own, sized by budget (required, daily); the new budget and the switch go out in one atomic Google mutate. A campaign that already has its own budget returns 409 for null. The budget a campaign leaves is not removed. The response carries the budget the campaign now uses.

OpenAI Ads campaigns carry exactly one spend cap: budget.type daily or lifetime replaces whichever cap the campaign had, with a minimum of 1 in the ad account's currency (422 below it). Lifetime can switch to daily, but OpenAI never switches a daily cap back to lifetime (422).

Reddit Ads: budget changes the amount of a campaign budget (Reddit campaign budget optimization); a campaign whose ad groups carry the budget returns 409 or 422, use PUT /v1/ads/ad-sets/{adSetId} there. Reddit cannot switch a published budget between daily and lifetime, so budget.type must match the current one (422 otherwise). bidStrategy is set per ad group on Reddit (PUT /v1/ads/ad-sets/{adSetId}).

accountId forwards the update straight to Meta for a campaign with zero ads, which would otherwise 404; the response then carries updated: 0.