feat(server): Implement payment routes and handler initialization

- Add payment routes with placeholders for CreatePaymentIntent, ConfirmPayment, and HandleWebhook
- Introduce initializeServices method to set up payment service and handler
- Update Server struct to include paymentHandler
- Prepare infrastructure for payment-related functionality
- Enhance server initialization process with service setup

internal/server/server.go

@@ -6,14 +6,17 @@ import (
 
 	"attune-heart-therapy/internal/config"
 	"attune-heart-therapy/internal/database"
+	"attune-heart-therapy/internal/handlers"
+	"attune-heart-therapy/internal/services"
 
 	"github.com/gin-gonic/gin"
 )
 
 type Server struct {
-	config *config.Config
-	db     *database.DB
-	router *gin.Engine
+	config         *config.Config
+	db             *database.DB
+	router         *gin.Engine
+	paymentHandler *handlers.PaymentHandler
 }
 
 func New(cfg *config.Config) *Server {
@@ -51,6 +54,9 @@ func (s *Server) Initialize() error {
 		return fmt.Errorf("failed to seed database: %w", err)
 	}
 
+	// Initialize services and handlers
+	s.initializeServices()
+
 	log.Println("Server initialization completed successfully")
 	return nil
 }
@@ -117,18 +123,12 @@ func (s *Server) setupRoutes() {
 			})
 		}
 
-		// Payment routes (will be implemented in later tasks)
+		// Payment routes
 		payments := v1.Group("/payments")
 		{
-			payments.POST("/intent", func(c *gin.Context) {
-				c.JSON(501, gin.H{"message": "Not implemented yet"})
-			})
-			payments.POST("/confirm", func(c *gin.Context) {
-				c.JSON(501, gin.H{"message": "Not implemented yet"})
-			})
-			payments.POST("/webhook", func(c *gin.Context) {
-				c.JSON(501, gin.H{"message": "Not implemented yet"})
-			})
+			payments.POST("/intent", s.paymentHandler.CreatePaymentIntent)
+			payments.POST("/confirm", s.paymentHandler.ConfirmPayment)
+			payments.POST("/webhook", s.paymentHandler.HandleWebhook)
 		}
 
 		// Admin routes (will be implemented in later tasks)
@@ -141,6 +141,15 @@ func (s *Server) setupRoutes() {
 	}
 }
 
+// initializeServices sets up all services and handlers
+func (s *Server) initializeServices() {
+	// Initialize payment service
+	paymentService := services.NewPaymentService(s.config)
+
+	// Initialize payment handler
+	s.paymentHandler = handlers.NewPaymentHandler(paymentService)
+}
+
 // healthCheck handles the health check endpoint
 func (s *Server) healthCheck(c *gin.Context) {
 	response := gin.H{