diff --git a/workflow/cart/v1/workflow.go b/workflow/cart/v1/workflow.go
index 4003654..7453523 100644
--- a/workflow/cart/v1/workflow.go
+++ b/workflow/cart/v1/workflow.go
@@ -1,13 +1,17 @@
 package workflow
 
 import (
+	"fmt"
+	"log"
+	"strings"
+	"time"
+
 	cartv1 "github.com/taltemus/stacked-diff-example/gen/cart/v1"
 	"go.temporal.io/sdk/workflow"
 )
 
 type CartWorkflowReq struct {
-	Request  *cartv1.CartRequest
-	Response *cartv1.CartResponse
+	Request *cartv1.CartRequest
 }
 
 // CartWorkflowImpl implements the shopping cart workflow.
@@ -17,6 +21,47 @@ type CartWorkflow struct {
 }
 
 // Run executes the workflow.
-func (w *CartWorkflow) Run(ctx workflow.Context) {
-	panic("not implemented")
+func (w *CartWorkflow) Run(ctx workflow.Context) (*cartv1.CartResponse, error) {
+	log.Printf("Workflow started for cart: %s", w.Request.CartId)
+
+	// Split comma-separated ticket IDs.
+	ticketIDs := strings.Split(w.Request.TicketIds, ",")
+
+	// Call ReserveTickets (placeholder).
+	reserveStatus, _ := cartv1.ReserveTicketsActivity(ctx, &cartv1.ReserveTicketsInput{
+		CartId:    w.Request.CartId,
+		TicketIds: ticketIDs,
+	})
+
+	selector := workflow.NewSelector(ctx)
+	selector.AddReceive(cartv1.CancelCartSignalSignalChannel, func(c workflow.ReceiveChannel, more bool) {
+		log.Println("Cancellation signal received.")
+		w.cancelled = true
+	})
+	selector.AddFuture(workflow.NewTimer(ctx, 5*time.Minute), func(f workflow.Future) {
+		log.Println("Timeout reached.")
+		w.cancelled = true
+	})
+	for selector.HasPending() {
+		selector.Select(ctx)
+		if w.cancelled {
+			break
+		}
+	}
+
+	var removeStatus string
+	if w.cancelled {
+		resp, _ := cartv1.RemoveTicketsActivity(ctx, &cartv1.RemoveTicketsInput{
+			CartId:    w.Request.CartId,
+			TicketIds: ticketIDs,
+		})
+		removeStatus = resp.Status
+	} else {
+		cartv1.CheckoutCartActivity(ctx, &cartv1.CheckoutCartInput{})
+	}
+
+	return &cartv1.CartResponse{
+		Confirmation: fmt.Sprintf("Cart %s: Reserve [%s] -> Remove [%s]",
+			w.Request.CartId, reserveStatus, removeStatus),
+	}, nil
 }