Blackbaud checkout create transaction issue

Hi @Erik Leaver : Thank you for your response. I am following steps mentioned in above video.
Please refer more details related to my api work flow.

1)Donor selects amount in donation page.
2)Blackbaud checkout popup open
3)Donor select apple pay payment
4)Donor enter real card details and submit

API calls:

function onDonateNowClicked(sender, args) {

  // append any donor-entered information to the transaction obejct

  var amt = $('#' + '<%= txtamount.ClientID %>').val();


  var transactionData = {

      'key': '<key>',

      'payment_configuration_id': '<payment_configuration_id>',

      'amount': amt,

      'client_app_name': '<client_app_name>',

      'security_token': '<security_token>',

      'is_offline': true,

      'use_apple_pay': true,

      'use_apple_pay_donate_button': true

  };



  // call the Checkout method to display the payment form

  Blackbaud_OpenPaymentForm(transactionData);

  args.set_cancel(true); // Cancel default postback

}

<script src="https://payments.blackbaud.com/Checkout/bbCheckout.2.0.js"></script>

i got token also from checkoutComplete event.

Next I am calling transaction API
https://api.sky.blackbaud.com/payments/v1/checkout/transaction

with amount and checkoutComplete event token.

At that time api gives error Transaction is required.

Please help me to resolve this with priority.

@Mina Mistry @Heather Templeton : Please help me on this with urgent priority as it blocking development.

CC: @Erik Leaver