How to implement OTO with CB, without 1-click upsell?

Hi guys,

I am new to clickbank as a merchant and maybe some of
you with CB experience could answer this question of mine.

How do I technically implement OTO with CB without 1CU ?

Let's say I want to offer an OTO after the customer has paid
for the front end product.

Customer buys the front end product and then he/she must be sent
to the download page (according to CB rules, that is the
thankyou page link that I must provide in my CB account during
product approval period).

Front end product---->CB purchase -----> thankyou page

Now instead of automatically sending the customer to the
thankyoupage after the purchase, what do I do?

Do I have to replace the original thankyoupage with the sales
page for the OTO with 'yes/no' links and have two different
thankyou pages. If you do it that way, is that actually allowed
by CB?

Front end product---->CB purchase 1-----> OTO

OTO (YES) ----> CB purchase 2 --> thankyou page with both products
OTO (NO) ----> thankyou page with only front end product

When the front end product is approved by CB there is a thankyou page
URL in my CB account for that product that they checked and approved
because it really was a process and a thankyou page that comply to their
rules.

Now if I have to replace the approved thankyou page with the OTO page
and change the whole process after the payment, is that allowed?

Or are you doing it differently?

Almin