diff --git a/src/main/java/com/kipper/eventsmicroservice/controllers/EventController.java b/src/main/java/com/kipper/eventsmicroservice/controllers/EventController.java
index 347f142..7d70264 100644
--- a/src/main/java/com/kipper/eventsmicroservice/controllers/EventController.java
+++ b/src/main/java/com/kipper/eventsmicroservice/controllers/EventController.java
@@ -38,6 +38,6 @@ public Event createEvent(@RequestBody EventRequestDTO event) {
     @PostMapping("/{eventId}/register")
     public ResponseEntity<String> registerParticipant(@PathVariable String eventId, @RequestBody SubscriptionRequestDTO subscriptionRequest) {
         eventService.registerParticipant(eventId, subscriptionRequest.participantEmail());
-        return ResponseEntity.ok("Event created successfully");
+        return ResponseEntity.ok("Subscription confirmed successfully");
     }
 }
diff --git a/src/main/java/com/kipper/eventsmicroservice/services/EventService.java b/src/main/java/com/kipper/eventsmicroservice/services/EventService.java
index e8ab7c3..2bdf008 100644
--- a/src/main/java/com/kipper/eventsmicroservice/services/EventService.java
+++ b/src/main/java/com/kipper/eventsmicroservice/services/EventService.java
@@ -8,6 +8,9 @@
 import com.kipper.eventsmicroservice.exceptions.EventNotFoundException;
 import com.kipper.eventsmicroservice.repositories.EventRepository;
 import com.kipper.eventsmicroservice.repositories.SubscriptionRepository;
+
+import jakarta.transaction.Transactional;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
@@ -43,6 +46,8 @@ private Boolean isEventFull(Event event){
         return event.getRegisteredParticipants() >= event.getMaxParticipants();
     }
 
+    // Rollback the transaction, once the EmailServiceClient throws an exception - participantEmail must be verified in SES identities.
+    @Transactional
     public void registerParticipant(String eventId, String participantEmail) {
         Event event = eventRepository.findById(eventId).orElseThrow(EventNotFoundException::new);
 
@@ -55,6 +60,9 @@ public void registerParticipant(String eventId, String participantEmail) {
 
         event.setRegisteredParticipants(event.getRegisteredParticipants() + 1);
 
+        // update the new participant
+        eventRepository.save(event);
+
         EmailRequestDTO emailRequest = new EmailRequestDTO(participantEmail, "Confirmação de Inscrição", "Você foi inscrito no evento com sucesso!");
 
         emailServiceClient.sendEmail(emailRequest);