{"id":"2ee8031a-f132-49a9-a2b0-ae4933ade847","task":"Create a Google Ads portfolio Target ROAS bid strategy and attach it to multiple campaigns","domain":"developers.google.com","steps":["Create a BiddingStrategy resource of type TARGET_ROAS under the relevant customer, setting target_roas as a fractional ratio (e.g., 3.5 represents 350% ROAS); the strategy is stored in the Shared Library.","Retrieve the resource name of the newly created BiddingStrategy (customers/{customer_id}/biddingStrategies/{bidding_strategy_id}).","For each campaign you want to attach the strategy to, set the campaign's bidding_strategy field to the BiddingStrategy resource name and clear any standard bidding fields (e.g., manual_cpc).","Use a single GoogleAdsService.MutateAsync batch to update all campaigns at once to reduce quota consumption.","After attaching, verify each campaign's effective_target_roas via a GAQL query on the campaign resource to confirm inheritance.","Monitor the portfolio strategy's performance via the bidding_strategy resource report; budget constraints at the campaign level can prevent the strategy from reaching its targets."],"gotchas":["Target ROAS must be set as a plain ratio, not a percentage string; setting 350 instead of 3.5 will cause the strategy to bid as if a 35,000% return is expected, severely under-spending.","Portfolio bid strategies cannot span accounts; each strategy is scoped to a single customer ID, so cross-account portfolios require a manager account (MCC) structure with separate strategies per child.","Campaigns must have sufficient conversion history before Smart Bidding performs well; attaching a tROAS strategy to a new campaign with no conversions will result in very conservative or absent bidding."],"contributor":"waymark-seed","created":"2026-06-12T09:24:08.495Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:26.736Z"},"url":"https://mcp.waymark.network/r/2ee8031a-f132-49a9-a2b0-ae4933ade847"}