diff --git a/main.py b/main.py
index 337a56a..fb33548 100644
--- a/main.py
+++ b/main.py
@@ -156,7 +156,7 @@ class SignalAPI:
         async for websocket in websockets.connect(f"{ws_url}/v1/receive/{self.number}"):
             yield websocket
 
-    async def receive_messages(self, websocket) -> Result[Message, str]:
+    async def receive_message(self, websocket) -> Result[Message, str]:
         return parse_response(Message, await websocket.recv())
 
     def send_message(self, message: SendMessageSimple) -> Result[SendMessageResponse, str]:
@@ -224,12 +224,87 @@ class LabCleaningBot:
         async for websocket in self.api.websocket_connect_receive():
             try:
                 while True:
-                    message = await self.api.receive_messages(websocket)
-                    print(message)
+                    message_result = await self.api.receive_message(websocket)
+
+                    if is_err(message_result):
+                        print(message_result.unwrap_err())
+                        continue
+                    else:
+                        message = message_result.unwrap()
+
+                    self.message_received(message, session)
 
             except websockets.exceptions.ConnectionClosed:
                 print("Websockets connection closed. Reestablishing connection.")
 
+    def message_received(self, message: Message, session: Session):
+        envelope = message.envelope
+
+        match envelope:
+            # Normal direct message (no edits, no reactions)
+            case EnvelopeData(dataMessage=DataMessage(message=message, groupInfo=None), sourceNumber=sourceNumber):
+                print(message, "direct", sourceNumber)
+            # Normal group message (no edits, no reactions)
+            case EnvelopeData(dataMessage=DataMessage(message=message, groupInfo=GroupInfo(groupId=group_id)), sourceNumber=sourceNumber):
+                print(message, group_id)
+            # Reaction in direct messages
+            case EnvelopeData(
+                dataMessage=ReactionMessage(
+                    reaction=Reaction(
+                        emoji=emoji,
+                        isRemove=isRemove,
+                        targetSentTimestamp=targetSentTimestamp
+                    ),
+                    groupInfo=None,
+                    timestamp=timestamp
+                ),
+                sourceNumber=sourceNumber):
+
+                reactionTimestamp = signal_timestamp_to_datetime(timestamp)
+                requestTimestamp = signal_timestamp_to_datetime(targetSentTimestamp)
+
+                maybe_request = get_participation_request_by_timestamp(session, requestTimestamp)
+
+                if is_err(maybe_request):
+                    print("No participation request found for timestamp %s." % requestTimestamp)
+                    return
+
+                request = maybe_request.unwrap()
+
+                response_msg = ""
+
+                if emoji == "👍" and not isRemove:
+                    accept_result = request.try_accept(now=reactionTimestamp)
+
+                    match accept_result:
+                        case Ok(AcceptInTime()):
+                            response_msg = "You accepted the request."
+                        case Ok(AcceptAfterRejectAllowed()):
+                            response_msg = "You accepted the request after rejecting it."
+                        case Err(AcceptAfterRejectExpired()):
+                            response_msg = "You cannot accept the request after rejecting it after 5 minutes."
+                        case Err(AlreadyAccepted()):
+                            response_msg = "You already accepted the request."
+                        case Err(AcceptAfterTimeout()):
+                            response_msg = "You cannot accept the request after the timeout."
+                else:
+                    reject_result = request.try_reject(now=reactionTimestamp)
+
+                    match reject_result:
+                        case Ok(RejectInTime()):
+                            response_msg = "You rejected the request."
+                        case Ok(RejectAfterAccept()):
+                            response_msg = "You rejected the request after accepting it."
+                        case Err(AlreadyRejected()):
+                            response_msg = "You already rejected the request."
+                        case Err(RejectAfterTimeout()):
+                            response_msg = "You cannot reject the request after the timeout."
+
+                self.api.send_message(
+                    SendMessageSimple(message=response_msg, recipients=[sourceNumber]))
+
+                print(emoji, "direct", sourceNumber, isRemove)
+
     async def sync_members_and_tasks(self, session: Session):
         unfulfillable_tasks = []
 
diff --git a/models.py b/models.py
index c9dabd6..33b14b1 100644
--- a/models.py
+++ b/models.py
@@ -69,6 +69,15 @@ def get_user_by_name(session: Session, name: str, only_active: bool = True) -> R
     else:
         return Ok(user)
 
+def get_participation_request_by_timestamp(session: Session, timestamp: datetime.datetime) -> Result["ParticipationRequest", None]:
+    Q = select(ParticipationRequest).where(ParticipationRequest.requested_at == timestamp)
+    request = session.exec(Q).first()
+
+    if request is None:
+        return Err(None)
+    else:
+        return Ok(request)
+
 class Task(SQLModel, table=True):
     id: int = Field(primary_key=True)
     name: str