I’m preparing to release a new QuickBooks Online developer app and want clear, battle-tested advice that will help me pass Intuit’s review on the first attempt. My goal is to understand every milestone—from setting up keys in the Intuit Developer portal to completing the OAuth 2.0 security checklist, sandbox testing, and Marketplace listing requirements—so I can move forward with confidence. I already have a basic concept and some code running locally; what I’m missing is a concise roadmap that spells out best practices, common pitfalls, and any changes in the most recent QuickBooks API policies that could trip me up. I’d like the engagement to cover: • A one-hour video or voice consultation where we walk through the full submission process, compliance checklist, and typical rejection reasons. • A short follow-up document (bullet points are fine) summarising the key steps, links to Intuit documentation, and any tooling or logging tips that speed up approval. If you have recent, first-hand experience launching a QuickBooks app—and can point to at least one successful listing—your insights will be invaluable.