The developer of Draft Desk, a hypothetical Next.js app where teams review documents, wants a coding agent to connect its buy button to Stripe. The first monthly plan lets a workspace export finished drafts. With hosted Checkout, Stripe gives the buyer a page to pay on while Draft Desk handles who can buy the plan, which workspace gets access, and what happens at renewal.
Leave seats, coupons, and trials for later unless the first buyer needs them. Each option adds another billing rule you need to give the agent and check in the code.
Prepare one offer and one test workspace
For Draft Desk's first plan, only the workspace owner can buy a subscription. The plan has no trial, and if the owner cancels, the team can still export drafts through the period it already paid for. Give the agent these rules alongside the test workspace so it can check both the purchase and the change in access when someone cancels.
Create a recurring price in your Stripe test environment. Keep its ID in server config, then ask the agent to create a Checkout Session with subscription mode and that price. Use the API reference that matches the SDK installed in your app. Stripe Checkout Session API
Give the agent setting names with harmless sample values. Put the real Stripe secret key in server settings. A publishable key can be used in browser code, but a secret key must stay out of the browser and source control. Stripe key guidance
Make the checkout route prove ownership
When the owner clicks Buy, the browser calls a server route that requires sign-in. The route finds the caller's workspace, checks their billing role, and chooses the allowed Stripe price from server settings. A caller can change any input the browser sends, which is why the server makes all three decisions.
Save the checkout attempt with the workspace ID, then add Stripe's Session ID to the same record when Stripe returns it. The app can use that link when a payment notice arrives to find the workspace that started the purchase.
Decide how the server will find the same open checkout attempt when the owner clicks twice or the browser retries a request. Store the attempt where both server instances can read it, since each instance has its own memory and could create a separate order. Use any Stripe request key for that same checkout attempt, following Stripe's rules for the API call.
Once the route returns the hosted Checkout URL, the browser sends the buyer to Stripe. In the review, ask the agent to show how one workspace maps to one attempt in the app and one Session in Stripe.
Give the return page a truthful job
When the buyer comes back from Stripe, show the payment state your server has confirmed. While the server is still checking, the page can say so and offer an order reference for support. A buyer can change success=true in the URL, so the page needs to read confirmed state from the server before showing paid access.
A buyer can close the tab after paying, or their connection can fail before the return page loads. Set up a server event route so Draft Desk can finish the purchase without that visit. Stripe calls this step fulfillment. Stripe fulfillment guide
Verify Stripe's signature using the endpoint secret and the unchanged request body. Keep the response prompt after the work has been safely stored or accepted by a durable system. Follow the hosting platform's rules for any later work. An unawaited task inside a request handler is easy to lose when the process stops. Stripe webhooks
Include the second month in the first code review
After the first payment, Stripe sends invoice and subscription events for renewals, failed payments, and cancellation. Choose the events that correspond to Draft Desk's access rules, then apply those rules in one place so each event updates access consistently. Stripe subscription events
Send the same event twice and confirm that a paid invoice grants its period only once. Then deliver an older notice after a newer change and check that it leaves access correct. If the app can't tell from a notice what should happen next, have it read current billing state from a trusted source before changing access.
Ask the agent to run the flow with Stripe's documented test values for a normal payment, a decline, and a card that needs extra confirmation. Then close the tab after paying, replay an event, and try a request from another workspace. Call the paid API route after each case to see whether the team can export. Stripe testing
Save the results with the release reference and safe IDs, leaving any unrun case open. That gives the reviewer a record of which behavior the deployed app has shown.
Choose the Forte flow when it fits your app
On Forte, use the Subscriptions API and Stripe Elements for a single monthly plan. If you sell a plan with a one-time item, use the Checkout API and confirm the payment with the client secret it returns. Give the agent the steps for the API you choose so it doesn't try to redirect the buyer to a hosted Checkout page in the Forte flow. Forte subscriptions, Forte Checkout
Start in a Sandbox Project, connect payment triggers to your Service, and run the same ownership and access checks. The trigger handler uses Forte's documented trusted-header rule. Live payments need approved compliance registration. Read the Forte payment guide before asking the agent to wire confirmation and event handling.