rajnandan1

import Foundation
import UIKit
import CashfreePGCoreSDK
import CashfreePG
class YourViewController: UIViewController, CFCardPaymentDelegate, CFNetbankingPaymentDelegate, CFWalletPaymentDelegate, CFUPIPaymentDelegate, CFPaylaterPaymentDelegate {
    
    private let cfPaymentGatewayService = CFPaymentGatewayService.getInstance()
    
    override func viewDidLoad() {
        self.cfPaymentGatewayService.setCallback(self)

rajnandan1

function valid_upi(upiID){
  const upiRegex = /^[a-zA-Z0-9_\-\.]+@[a-zA-Z]{3,}$/;
  return upiRegex.test(upiID)
}

rajnandan1

function valid_card(value) {
    // Accept only digits, dashes or spaces
    if (/[^0-9-\s]+/.test(value)) return false;

    // The Luhn Algorithm. It's so pretty.
    let nCheck = 0,
        bEven = false;
    value = value.replace(/\D/g, "");

    for (var n = value.length - 1; n >= 0; n--) {

rajnandan1

function getCardType(number) {
    var res = {
        id: null,
        name: null
    };
    if (number.length <= 2) return res;

    var re = new RegExp("^4");
    if (number.match(re) != null) {
        res.id = "visa";