AcquirerRouter.java

package com.checkout.paymentgw.bank.client;

import com.checkout.paymentgw.bank.api.dto.AuthorisationCommand;
import com.checkout.paymentgw.bank.api.dto.AuthorisationResult;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;

/**
 * Picks the right downstream {@link BankClient} per command. For the demo we
 * have only one acquirer; in production this is where BIN / currency / merchant
 * routing logic lives.
 */
@Primary
@Component
public class AcquirerRouter implements BankClient {

    private final MountebankBankClient mountebank;

    public AcquirerRouter(MountebankBankClient mountebank) {
        this.mountebank = mountebank;
    }

    @Override
    public AuthorisationResult authorise(AuthorisationCommand command) {
        // Real routing would look at command.cardNumber() BIN range, merchant config, etc.
        return mountebank.authorise(command);
    }
}