WordPress - WooCommerce Scratch Card

General information for the website: An ecommerce plugin
Description of requirements/features: Hi There.

I have a client who wants to offer a free scratch card (scratch and win card) giveaway when a customer purchases an item through their WooCommerce ecommerce store.

For example. The customer purchases a product, after the purchase has been completed they are then offered a free scratch card that will give them the chance of winning a prize.

The transaction would need to be simple. i.e. The customer purchases the product, once the transaction is completed, they are then sent to a page where they can scratch the scratch card.
We need the ability to add prizes to each scratch card. The scratch cards need to be mobile friendly too.

There will be lots of different prizes that can be won across the website. So a customer may wish to purchase multiple different products, which then gives them the chance to win multiple items.

Other things to consider:

Recommend a Friend - A customer can have the option to invite their friends via facebook (sharing). In return if that recommended friend purchases from the website, they are then given a free scratch card that doesn’t require a purchase.

Bulk Deals – For example if customer purchases 5 products on the website, they will then be given a free scratch card.

Regards
Tom
P.S. Im only looking for a UK developer, so i can speak to them on the telephone.
Specific technologies required: PHP, WordPress, WooCommerce
Extra notes: