Do I understand right that you click pay on the checkout page, get redirected to another page, complete the payment and then automatically get back to your website page? If it’s not, please describe how it works and send me a link to the webpage where you’d like the widget to appear?
I see that you’ve already found a way to add a link to claim the prize. Also you can direct users to contact you via phone or email:
I guess it will be possible to implement the unique spin numbers once the form feature is released. I see that you’ve already created a request for this on the Wishlist and we’ll keep you in the loop there