Downloading a template solves the first layout problem, not the production problem. Before launch, every external service, protected action, error path, and public page needs an explicit owner and a test that reflects the deployed environment.
Separate Local And Production Configuration
Keep local development values in an ignored environment file and configure production secrets in the hosting provider. Public browser variables must never contain API secrets, webhook signing keys, storage credentials, or admin passwords.
Document each required variable with its purpose and expected format, but leave the value blank in committed examples. Validate critical variables at startup so a missing payment or storage key fails clearly instead of causing a vague customer-facing error.
Protect Authentication And Return Paths
Authentication should preserve the page or action the customer intended to use. After sign-in or account creation, return the user to the selected template, download, or checkout rather than sending everyone to a generic dashboard.
Test expired sessions, invalid passwords, OAuth callback errors, password resets, sign-out, and multiple browser tabs. Server-side authorization must protect private routes even when the corresponding button is hidden in the interface.
Verify Payment Fulfillment End To End
A successful checkout screen is not proof of entitlement. Verify the transaction with the payment provider, match the signed purchase intent, customer, product, and price, then record access idempotently. Webhooks provide recovery when the browser closes before the success page finishes.
Run tests for a valid purchase, an incorrect price ID, a replayed webhook, a repeated success-page refresh, and an account trying to download a different product. Private files should be served only through short-lived authorized responses, never predictable public object URLs.
Prepare Public Pages For Search And Sharing
Give each valuable public page a unique title, description, canonical URL, heading, and useful body content. Noindex account, admin, checkout result, filtered search, duplicate, and thin generated pages. A sitemap should contain only canonical pages that you genuinely want search engines to index.
Open Graph images, structured data, and keywords help describe a page, but they cannot replace original visible content. Search crawlers and human visitors should reach the same useful explanation without signing in.
Measure Performance And Failure Modes
Run a production build, inspect client bundle warnings, and test slow network behavior. Reserve image and advertising dimensions to prevent layout shift. Avoid loading large libraries or third-party scripts on routes that do not use them.
Add structured logs for authentication, checkout verification, webhooks, downloads, and storage failures. Logs should include a safe request or error identifier, not passwords, tokens, or full payment data. A health endpoint can verify required integrations without revealing credentials.
Complete A Release Rehearsal
Use a staging or sandbox environment to rehearse account creation, checkout, purchase recovery, download, refund handling, contact forms, and mobile navigation. Then repeat a smaller smoke test against the production domain after deployment.
Treat the checklist as living documentation. When a real incident exposes a missing case, add the test to the release process so the same failure becomes less likely on the next update.
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