feat: implement Stripe checkout integration and add related API endpoints

server/api/transactions.post.ts

@@ -0,0 +1,36 @@
+export default defineEventHandler(async (event) => {
+  const body = await readBody<{
+    stripeSessionId: string
+    designId: string
+    templateId?: string
+    amount: number
+    currency: string
+    customerEmail?: string
+    assets?: {
+      previewUrl?: string
+      productionUrl?: string
+    }
+  }>(event)
+
+  if (!body?.stripeSessionId || !body?.designId) {
+    throw createError({ statusCode: 400, statusMessage: 'Missing required fields' })
+  }
+
+  // TODO: Persist the transaction to your database of choice.
+  // Example shape:
+  // await db.transaction.create({
+  //   stripeSessionId: body.stripeSessionId,
+  //   designId: body.designId,
+  //   templateId: body.templateId,
+  //   amount: body.amount,
+  //   currency: body.currency,
+  //   customerEmail: body.customerEmail,
+  //   previewUrl: body.assets?.previewUrl,
+  //   productionUrl: body.assets?.productionUrl,
+  // })
+
+  return {
+    ok: true,
+    receivedAt: new Date().toISOString(),
+  }
+})