Customer journey on the Thank You page.

When the customer completes his order without insurance, then the customer can also add insurance at the thank you page.

After completing the order, the customer can also buy from here.

After clicking on the "Add To Order," the customer will get an email to pay the amount of insurance.

And the customer can make payment from the mail they received.

The customer will get an email like this. and the customer can pay from there.