add payment notification endpoint

src/main/java/_11/asktpk/artisanconnectbackend/controller/PaymentController.java

@@ -0,0 +1,62 @@
+package _11.asktpk.artisanconnectbackend.controller;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.util.DigestUtils;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Map;
+import java.util.stream.Collectors;
+
+@RestController
+@RequestMapping("/api/v1/payments")
+public class PaymentController {
+
+    @Value("${tpay.securityCode}")
+    private String sellerSecurityCode;
+
+    private static final Logger log = LoggerFactory.getLogger(PaymentController.class);
+
+    @PostMapping(value = "/notification", consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
+    public ResponseEntity<String> handleTpayNotification(@RequestParam Map<String, String> params) {
+        log.info("=== ODEBRANO NOTYFIKACJĘ Tpay ===");
+        log.info("Parametry:\n{}", paramsToLogString(params));
+
+        String id = params.get("id");
+        String trId = params.get("tr_id");
+        String trAmount = params.get("tr_amount");
+        String trCrc = params.get("tr_crc");
+        String md5sum = params.get("md5sum");
+        String trStatus = params.get("tr_status");
+
+        String expectedMd5 = DigestUtils.md5DigestAsHex(
+                (id + trId + trAmount + trCrc + sellerSecurityCode).getBytes()
+        );
+
+        if (!expectedMd5.equals(md5sum)) {
+            log.warn("❌ Błędna suma kontrolna! Otrzymano: {}, Oczekiwano: {}", md5sum, expectedMd5);
+            return ResponseEntity.status(400).body("INVALID CHECKSUM");
+        }
+
+        if ("true".equals(trStatus)) {
+            log.info("✅ Transakcja opłacona: tr_id={}, kwota={}", trId, params.get("tr_paid"));
+        } else if ("chargeback".equals(trStatus)) {
+            log.warn("⚠️ Chargeback: {}", trId);
+        }
+
+        return ResponseEntity.ok("TRUE");
+    }
+
+    private String paramsToLogString(Map<String, String> params) {
+        return params.entrySet().stream()
+                .map(e -> e.getKey() + " = " + e.getValue())
+                .collect(Collectors.joining("\n"));
+    }
+}

src/main/resources/application.properties

@@ -22,4 +22,7 @@ tpay.clientId = 01JQKC048X62ST9V59HNRSXD92-01JQKC2CQHPYXQFSFX8BKC24BX
 tpay.clientSecret = 44898642be53381cdcc47f3e44bf5a15e592f5d270fc3a6cf6fb81a8b8ebffb9
 tpay.authUrl = https://openapi.sandbox.tpay.com/oauth/auth
 tpay.transactionUrl = https://openapi.sandbox.tpay.com/transactions
+tpay.securityCode = )IY7E)YSM!A)Q6O-GN#U7U_33s9qObk8
 
+logging.file.name=logs/payment-notifications.log
+logging.level.TpayLogger=INFO