Acceptance Criteria

• Copy the kontocheck implementation (and System test) from the fundraising app to the payment repository
• Change the build instructions in fundraising-frontend-docker to build a new release (e.g. :5-dev, :5-composer whenever a dependency changes).
• The use case validates the Iban with the ValidateIban use case, passed in as a dependency of the "Create Payment" use case.

Implementation Notes

• Adapt the namespace of the kontocheck IBAN validation to WMDE\Fundraising\PaymentContext\Services. Later tickets will also move the API services for external payment providers here.
• Use a 8.1 version of the FUN docker images that contains the kontocheck extension
• Refactor the CheckIbanUseCase to return a better response, e.g. two classes, a simple boolean or enum (Valid/Invalid).
• Use the CheckIbanUseCase as a dependency of the CreatePayment use case.
• BankDataValidator can probably be removed