Common Issues

• Some endpoints use next_page_token.
• Others use page_number + page_size.
• For large accounts, always code defensively for partial results.

Token Expiry / Scopes

• Access token is expired: refresh or request a new S2S token.
• does not contain scopes: add scopes in Marketplace and re-authorize users (User OAuth).

Webhooks

• Webhooks are at-least-once delivery: design idempotent handlers.
• Verify signatures and handle endpoint.url_validation.

Also See

• common-errors.md
• token-scope-playbook.md