usd_and_inr_payment.js

//payment_setup_certification.html
<script>
	frappe.ready(function() {
		$('.next').on('click', function() {
			if($("input[type=radio]:checked").val() == 'INR'){
				window.location = '/certification-application?new=1&currency=INR'
			}
			else{
				window.location = '/certification-application?new=1&currency=USD'
			}
		})
	})
</script>


//certification_application.js

frappe.ready(function() {
    // bind events here
    $(".page-header-actions-block .btn-primary, .page-header-actions-block .btn-default").addClass('hidden');
    $(".text-right .btn-primary").addClass('hidden');

    if(frappe.utils.get_url_arg('currency') == "INR") {
      console.log("Hello INR")
      user_name = frappe.full_name
      user_email_id = frappe.session.user
      $('[data-fieldname="currency"]').val("INR");
      $('[data-fieldname="name_of_applicant"]').val(user_name);
      $('[data-fieldname="email"]').val(user_email_id);
      $('[data-fieldname="amount"]').val(20000);
    } else {
      console.log("Hello USD")
      user_name = frappe.full_name
      user_email_id = frappe.session.user
      $('[data-fieldname="currency"]').val("USD");
      $('[data-fieldname="name_of_applicant"]').val(user_name);
      $('[data-fieldname="email"]').val(user_email_id);
      $('[data-fieldname="amount"]').val(300);
    }
})