Sync Adapter to Java 25: add StripePaymentClassAdapter, README mapping

02-structural/adapter/StripePaymentClassAdapter.java

@@ -0,0 +1,23 @@
+package adapter;
+// Class Adapter: extends Adaptee, implements Target
+// Can only be used when you CAN extend the Adaptee (it's not final)
+public class StripePaymentClassAdapter extends StripeClient implements PaymentGateway {
+    public StripePaymentClassAdapter(String apiKey) {
+        super(apiKey);
+    }
+    @Override
+    public boolean charge(String customerId, double amount, String currency) {
+        long cents = Math.round(amount * 100);
+        return createCharge(customerId, cents, currency.toLowerCase()).success;
+        // Note: calls inherited method directly — no 'stripe.' prefix needed
+    }
+    @Override
+    public boolean refund(String transactionId, double amount) {
+        return issueRefund(transactionId, Math.round(amount * 100));
+    }
+    @Override
+    public String getStatus(String transactionId) {
+        StripeChargeResult r = retrieveCharge(transactionId);
+        return r.success ? (r.status != null ? r.status.toUpperCase() : "UNKNOWN") : "FAILED";
+    }
+}