How does my app get into the App Store and Google Play?

Publishing has four stages: the developer account, the signed build, the store assets and the review. Each stage has fixed requirements, and rejections almost always come from missing assets, not from code.

Short answer

You open a developer account: Apple is billed yearly, Google once at signup.
The platform generates the signed build each store requires.
You upload the assets: icon, screenshots, description, a public privacy policy.
You submit for review; the first approval usually takes 1–3 days.

What you need before starting

The company verified with Apple and Google (legal name, address, matching contact details).
A privacy policy published at a link that opens without logging in.
A working test account for the review team, with real data in it.

The most common rejection reasons

The test account does not work or was not provided at all.
The app has accounts but offers no in-app account deletion (an Apple requirement).
The data safety declaration does not match what the app does (a Google requirement).
The screenshots show something other than the real app.

What happens after approval

The app becomes visible in the stores within a few hours of approval.
Each new version goes through review again, usually faster.
Content changes, as opposed to functionality changes, reach users without a new review.

How 4myapp helps

4myapp generates the signed builds for both stores from the same project and prepares the required assets: icons in every size, screenshots from your real app, the privacy policy and the account-deletion page, filled in with your company's details.