diff --git a/app/api/routes-b/invoices/[id]/route.ts b/app/api/routes-b/invoices/[id]/route.ts
new file mode 100644
index 00000000..3e92749e
--- /dev/null
+++ b/app/api/routes-b/invoices/[id]/route.ts
@@ -0,0 +1,49 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { prisma } from '@/lib/db'
+import { verifyAuthToken } from '@/lib/auth'
+import { logger } from '@/lib/logger'
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: { id: string } }
+) {
+  try {
+    // Verify auth
+    const authToken = request.headers.get('authorization')?.replace('Bearer ', '')
+    if (!authToken) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
+
+    const claims = await verifyAuthToken(authToken)
+    if (!claims) {
+      return NextResponse.json({ error: 'Invalid token' }, { status: 401 })
+    }
+
+    const user = await prisma.user.findUnique({
+      where: { privyId: claims.userId },
+    })
+
+    if (!user) {
+      return NextResponse.json({ error: 'User not found' }, { status: 404 })
+    }
+
+    // Find invoice
+    const invoice = await prisma.invoice.findUnique({
+      where: { id: params.id },
+    })
+
+    if (!invoice) {
+      return NextResponse.json({ error: 'Invoice not found' }, { status: 404 })
+    }
+
+    // Verify ownership
+    if (invoice.userId !== user.id) {
+      return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
+    }
+
+    return NextResponse.json(invoice)
+  } catch (error) {
+    logger.error({ err: error }, 'Invoice GET error')
+    return NextResponse.json({ error: 'Failed to get invoice' }, { status: 500 })
+  }
+}
\ No newline at end of file