[Feature]: implement checkout middleware and fix payment error

[Baroshem]

How the project can be improved?

Currently we do not have checkout middleware so client can go to customer and then click to move to payment directly and it will result in a wrong flow of order. Also We will have a transition to thank you even thought the process was not handled correctly.

What are the acceptance criteria?

• Create checkout middleware that will allow user to move further in the checkout process only when the required data has been added
• Handle order payment error similarly to how it was handled when there was existing customer set for order.

Additional information

No response

Code of Conduct

• I agree to follow this project's Code of Conduct