Confirmation email sent with receipt details

A confirmation email is the shopper's receipt, their order-number reference for support tickets, and their trust signal that the payment went through. Missing it triggers support load ("did my order go through?"), chargebacks from shoppers who don't remember the purchase, and erodes repeat-purchase trust. It's also often a legal requirement under consumer-protection regimes — EU Consumer Rights Directive Article 8 mandates confirmation of distance contracts in a durable medium, which a missing email fails outright.

Call a transactional email service (Resend, Postmark, SendGrid, SES) from the order completion handler at src/app/api/orders/route.ts. Include order number, line items, total, and shipping/tracking info. Send before returning success to the client so the email is sent even if the client navigates away.

await sendEmail({ to: order.customerEmail, template: 'order-confirmation', data: { orderNumber: order.id, items: order.items, total: order.total, trackingUrl: `https://yoursite.com/orders/${order.id}/tracking` } })