Problem closing Sweet Alert Library which has a timer - ajax

Question

Am working on an application build using Laravel. I have a payment page which is designed in a way when the user clicks on payment button, I trigger sweet alert Library with a message that the user should check his phone. The sweet alert popup also has a countdown timer for 60 seconds that works fine.
When the timer is counting, I am pushing the payload to the backend via AJAX whereby I consume the payment gateway API (which initiates STK push to the phone of the user with payment details).
When the payment is successful, I need to close the sweet alert popup box and redirect to another page which am unable to do. Kindly assist?
<script>
//When payment button is clicked
$("#payment").submit(function( event ) {
event.preventDefault();
//Initiate sweet alert library with a countdown timer of 60 seconds
var timer = 60,
isTimerStarted = false;
(function customSwal() {
swal({
title: "Message Sent",
text: "Please Check your Phone..." + timer,
timer: !isTimerStarted ? timer * 1000 : undefined,
showConfirmButton: false,
closeOnClickOutside: false,
showCancelButton: false,
});
isTimerStarted = true;
if(timer) {
timer--;
setTimeout(customSwal, 1000);
}
})();
//END sweet alert
//Fetch data from form
var token = $('#token').val();
var phone = $("#phone").val();
var email = $("#email").val();
var plan = $("#plan").val();
var amt = $("#amount").val();
var type ={
'token': token,
'phone' : phone,
'email' : email,
'plan' : plan,
'amt' : amt
};
// console.log(type);
$.ajax({
type: "POST",
url: "payment",
data:JSON.stringify(type),
contentType: 'application/json',
dataType: "json",
success: function(response){
//On success
if(response == 'suc'){
//Add code to remove the sweet alert popup
//Page to redirect to
window.location.href="success" ;
}
},
//Alert errors from backend
error: function(data) {
//console.log(data);
}
});
});
//END submission
</script>