How to set up a Web Hook for On-Demand ISR in Next.js

export default async function handler(request, response) {
  if (request.method !== 'POST') {
    return response.status(405).send('Method Not Allowed')
  }

  const Authorization = request.headers.authorization || ''
  const token = Authorization.replace(/bearer/i, '').trim()

  if (token !== process.env.NEXT_REVALIDATION_TOKEN) {
    return response.status(401).send('Unauthorized')
  }

  try {
    const paths = getRevalidationPaths(request.body).filter(Boolean)

    if (paths.length === 0) {
      return response.status(400).send('Bad Request')
    }

    await Promise.all(paths.map(path => response.revalidate(path)))
    return response.status(204).send('No Content')
  } catch (error) {
    console.error(error)
    return response.status(500).send('Internal Server Error')
  }
}