CheckoutTokenRequest constructor Null safety

CheckoutTokenRequest(
  1. String? name,
  2. String? number,
  3. int? expiryMonth,
  4. int? expiryYear,
  5. String? cvv,
  6. {String? type = CheckoutTokenRequest.CARD,
  7. CheckoutBillingAddress? billingAddress,
  8. CheckoutPhone? phone}
)