[Conditions for checking some CC cards] #forms

snippet.js

if (value.startsWith('34') || value.startsWith('37')) {
  return 'americanExpress'
}

if (value.startsWith('62')) {
  return 'chinaUnionPay'
}

if (value.startsWith('6011') || value.startsWith('65')) {
  return 'DiscoverCard'
}

if (Number(value.slice(0, 3)) >= 644 && Number(value.slice(0, 3)) <= 649) {
  return 'DiscoverCard'
}