Mobile Ads Attribution Setup

Accurate, end-to-end attribution is the last piece missing from my Android and iOS app marketing stack. I need every Google Ads and Meta Ads click to resolve cleanly into installs, sign-ups and the entire order journey so I can finally calculate true ROAS... (Budget: ₹1500 - ₹12500 INR, Jobs: Analytics, Android, App Development, Google Ads, iOS, JavaScript, Mobile App Development, PHP)