Learn how to set up compliant ad accounts across platforms by implementing the specific documentation, verification, and payment infrastructure each channel now demands. The 2026 regulatory environment has tightened identity verification on all major platforms, requiring media buyers to submit updated business credentials, tax documentation, and payment method validation for account activation. This guide details the exact submission requirements for each platform, common rejection reasons, and the fastest paths to account approval without delays. You'll learn which documents platforms prioritize, how to structure business information for algorithm review systems, and strategies for maintaining multiple accounts without triggering automated flags. Teams managing accounts for agencies, brands, or performance marketing operations will find platform-by-platform checklists that eliminate guesswork and accelerate onboarding.