Invoicing & Help Desk App Templates for Your SaaS

Business operations tools — invoicing, help desk, and document management — are consistently profitable SaaS niches. These applications share common patterns: user authentication, data management, search, and notification systems.

Invoicing and help desk app templates give you a production-ready foundation with billing logic, ticket management, and customer communication features.

Invoicing App Features

A complete invoicing template includes:

• Invoice creation with line items
• Client management
• Payment tracking
• Recurring invoices
• Expense tracking
• Financial reports
• Tax calculation
• PDF generation

Help Desk Software Features

A help desk template provides:

• Ticket creation and assignment
• Priority and status management
• Customer satisfaction surveys
• Knowledge base integration
• SLA tracking
• Team collaboration

The Admin Dashboard Pro includes invoicing and ticket management modules.

Invoice Generation API

// app/api/invoices/route.ts
import { NextResponse } from 'next/server'
import { auth } from '@/lib/auth'
import { prisma } from '@/lib/prisma'

export async function POST(req: Request) {
  const session = await auth()
  if (!session?.user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })

  const { clientId, items, dueDate, notes } = await req.json()

  const total = items.reduce((sum: number, item: any) =>
    sum + item.quantity * item.unitPrice, 0
  )

  const invoice = await prisma.invoice.create({
    data: {
      userId: session.user.id,
      clientId,
      invoiceNumber: `INV-${Date.now()}`,
      items: JSON.stringify(items),
      total,
      dueDate: new Date(dueDate),
      notes,
      status: 'draft',
    },
  })

  return NextResponse.json(invoice)
}

export async function GET(req: Request) {
  const session = await auth()
  if (!session?.user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })

  const invoices = await prisma.invoice.findMany({
    where: { userId: session.user.id },
    include: { client: true },
    orderBy: { createdAt: 'desc' },
  })

  return NextResponse.json(invoices)
}

Help Desk Ticket Component

'use client'

import { useState } from 'react'
import { MessageSquare, AlertCircle, CheckCircle, Clock } from 'lucide-react'

const statusIcons = {
  open: AlertCircle,
  in_progress: Clock,
  resolved: CheckCircle,
}

const statusColors = {
  open: 'text-red-500 bg-red-50',
  in_progress: 'text-yellow-500 bg-yellow-50',
  resolved: 'text-green-500 bg-green-50',
}

interface Ticket {
  id: string
  subject: string
  status: 'open' | 'in_progress' | 'resolved'
  priority: 'low' | 'medium' | 'high'
  customer: string
  updatedAt: string
}

export function TicketList({ tickets }: { tickets: Ticket[] }) {
  return (
    <div className="space-y-3">
      {tickets.map(ticket => {
        const Icon = statusIcons[ticket.status]
        return (
          <div key={ticket.id} className="rounded-xl border bg-white p-4 hover:shadow-sm transition-shadow">
            <div className="flex items-start justify-between">
              <div className="flex items-start gap-3">
                <div className={`rounded-lg p-2 ${statusColors[ticket.status]}`}>
                  <Icon className="h-5 w-5" />
                </div>
                <div>
                  <h4 className="font-semibold">{ticket.subject}</h4>
                  <p className="text-sm text-gray-500">{ticket.customer}</p>
                </div>
              </div>
              <span className={`rounded-full px-2.5 py-0.5 text-xs font-medium ${
                ticket.priority === 'high' ? 'bg-red-100 text-red-700' :
                ticket.priority === 'medium' ? 'bg-yellow-100 text-yellow-700' :
                'bg-green-100 text-green-700'
              }`}>
                {ticket.priority}
              </span>
            </div>
            <p className="mt-2 text-xs text-gray-400">
              Updated {new Date(ticket.updatedAt).toLocaleDateString()}
            </p>
          </div>
        )
      })}
    </div>
  )
}

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