objectives this platform accepts */ public function objectives(): array; /** @return list bid strategies this platform accepts */ public function bidStrategies(): array; /** @return list placements this platform accepts */ public function placements(): array; /** @return list calls to action this platform accepts */ public function callsToAction(): array; /** Smallest daily budget the platform will take, in whole currency units. */ public function minimumDailyBudget(): float; /** What the platform optimises toward for an objective. */ public function optimizationGoal(string $objective): ?string; /** The conversion event an objective counts, if any. */ public function conversionEvent(string $objective): ?string; /** Whether this objective cannot run without a conversion pixel. */ public function requiresPixel(string $objective): bool; /** * Anything else this platform requires that the shared checks cannot know. * * Returned as reasons phrased for the user, empty when nothing is wrong. * * @return list */ public function additionalProblems(Campaign $campaign): array; /** * Fields that can be changed on a live campaign. * * Everything else needs replacing rather than editing. On Meta an ad's * creative is immutable, so changing a headline means a new creative and a * new ad rather than an update. * * @return list */ public function editableAfterPublish(): array; }