Target CPA is your cost-per-sale goal ($). Target ROAS is a ratio — 4.0 means $4 back for every $1.
Leave a field blank to auto-detect from Google Ads. The priority is: Google's live target first, then your campaign setting, then your client setting, then the account average. Targets set here are used only to judge recommendations; see CPA vs ROAS for how each is applied.
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