If a customer returns 1 of 3 items, how much of the coupon discount is refunded?

The coupon discount at the time of order is split by each item's share of the price. The refund deducts only the returned item's portion.

What if two customers pay for the last item in stock at the same time?

Inventory is deducted only once. The payment approved later is canceled automatically.

What if a customer closes the window during payment?

Sayren checks the payment record with the PG again. If the payment went through but there is no order, it is canceled automatically.

If the PG doesn't respond, did the payment go through?

Payments with an unknown result are rechecked with the PG every minute and resolved as approved or not approved.

How are shipping fees charged on orders to Jeju Island?

Items shipped together are bundled so the shipping fee is charged once, and the regional surcharge is added.

What happens to the cash receipt after a refund?

The cash receipt is reissued with the amount adjusted for the refund.

Sayren

Commerce in depth

Vibe coding gets you the screen.
Sayren builds everything beneath it.

Most of an online store's work happens behind the screen, not on it. Pricing, inventory, payments and claims are all handled by the server.

What vibe coding builds

What customers see

−1Cart · CheckoutOption validationCheckout totalPurchase eligibility
−2PaymentsPG checkout windowAmount re-verificationApproval · Failure handling
−3InventoryConcurrent deductionsSold-out switchRestock on cancel
−4Shipping feesBundled shippingFree shipping rulesRemote-area surcharge
−5DiscountsCoupon hold · SettlementPoints use · Clawback
−6ClaimsCancel · Return · ExchangePickup · ReshipmentHolds · Deadlines
−7Refund settlementPartial refundsCoupon prorationReturn shipping fees
−8ReceiptsCash receipt issuanceAdjustments on refund
−9Alerts · SyncOrder event deliveryFailure retriesEmail
−10Logs · ReconciliationAudit logsResolving unknown paymentsDuplicate payment cancellation

Sayren builds all of this.10 layers below the screen · Nothing for sellers to build

What happens in operation

What happens when…?

Once orders pile up, a store that is only a screen has to answer questions like these. Click a question to see the answer.

The coupon discount at the time of order is split by each item's share of the price. The refund deducts only the returned item's portion.

AI storefront

Store screens built in code

Sellers own the entire storefront codebase. Build the screens that tell your brand's story exactly the way you want.

Typical store buildersYou fit into fixed slots.

Change theme colors and fonts
Arrange within the sections provided
Add widgets from apps

Sayren storefrontBuild the screens your brand wants, in code.

Fashion brand · 1/3

ATELIERSHOP · LOOKBOOK

Quiet
Linen2026 SUMMER COLLECTION

FRESH MARKETArrives today

Picked this morning,
on your table tonight

Seasonal fruit
30% off

NORTH JOURNAL · ISSUE 0707Six makers we met
by the northern sea

Own all of your screen code
Your own interactions and animations
Edit with AI · Edit as a developer

Change your screens with a single request.

The AI assistant edits the code based on your request. Sayren runs checks first, and only the version you've reviewed in preview goes live.

Start in the Sayren dashboard

Sayren dashboard · Storefront

Preview updated

MY STORE

SEASON SALE

New arrivals

AI assistant

Show new arrivals first on the home page, and switch the mobile product list to two columns.

Updating the home page and product list.

Edit screensDone

Rule checksDone

Prepare previewDone

Applied to the preview. Deploy once you've checked it.PreviewDeploy

Enter a requestShow new arrivals first on the home page, and switch the mobile product list to two columns.

Order flows

Change the order steps for each product.

For products that move differently, such as made-to-order items, bookings or delivery, add steps in the order flow editor and set how orders move between them. For each step, set the customer message, deadline, and cancellation and return permissions.

Custom order flows are available on the Premium plan and above.

Standard shippingNo shippingMade to orderFood deliveryTicketsLodging

Settings › Order flows ›Made-to-order flowDraftPublishedPreviewPublish

Seller · Add tracking no.Courier · DeliveredAfter 7 daysSeller · Confirm orderSeller · Upload proofCustomer · ApproveCustomer · Request changes

Payment completeStart

PreparingSeller · Production

ShippingPublic status · Shipping

DeliveredPublic status · Delivered

Purchase confirmedEnd

Proof reviewCustomer review

Add stepStepExternal API call

Flow published · Version 2

Step settings

Select a step to set its name, message, deadline and permissions.

Step nameProof review

Customer messageReview the proof, then approve it or request changes.

DeadlineNoneAuto-approve after 48 hours

Customer permissionsRequest cancellationRequest return

Features

Explore features

Case study

A fashion store built with Sayren

Built with sayren MCP. It covers everything from product listings to coupons, payments and orders.

Member coupons
Conditional free shipping
Payments · Orders
Mobile screens

Desktop home page of the example fashion store

Mobile home page of the example fashion store

Start your first store
for free.

No credit card required.

Start for free Talk to an expert

The next-gen interface for fashion, delivery, custom and booking commerceFashionDeliveryCustomBookingFashioncommerce,the next-gen interface

Vibe coding gets you the screen.Sayren builds everything beneath it.