Implement handling Blik level 0

[jakubtobiasz]

The goal of this task is to allow paying with Blik level 0 (the blik code is provided directly on the store, instead of redirecting a customer to Tpay's webiste).

We agreed the input should be displayed on the last step of the order placing process.

Small wins 🏆

• [ ] A customer can choose a Blik payment method
• [ ] A customer can provide a Blik code on the complete page
• [ ] A customer after providing a Blik code and completing the order sees a some kind of "Waiting for a payment" page
• [ ] A customer after providing a valid Blik code and completing the order sees a payment success page (or a notification)
• [ ] A customer after providing an invalid Blik code and completing the orders sees a payment failed page (or a notification)

Hints

• \CommerceWeavers\SyliusTpayPlugin\Payum\Action\CaptureAction – it is invoked as a first step of the payment process in Payum
• \CommerceWeavers\SyliusTpayPlugin\Payum\Action\Api\CreateTransactionAction – a class responsible for creating a transaction
• we need to find a way to pass a blik code to the CreateTransactionAction
• we might consider converting the CreateTransactionAction into an abstract class, then create a new CreateBlikTransactionAction, CreateCardTransactionAction, CreateRedirectTransactionAction, etc.; but we might skip it for now

Ref. https://docs-api.tpay.com/en/payment-methods/blik/#blik-level-0

[jakubtobiasz]

@lchrusciel I see on Tpay's mockups from other stores, there is a Terms & Conditions link. I bet it's T&C of Tpay, not the store itself. We need to validate it, and get the link do add it.