diff --git a/internal/api/api.go b/internal/api/api.go
index 6dca25d..5acd839 100644
--- a/internal/api/api.go
+++ b/internal/api/api.go
@@ -12,6 +12,14 @@ type ItemDTO struct {
 	id      int
 	message string
 }
+
+func (item ItemDTO) GetId() int {
+	return item.id
+}
+func (item ItemDTO) GetMessage() string {
+	return item.message
+}
+
 type UserDTO struct {
 	id int
 }
@@ -70,8 +78,67 @@ func RegisterRoutes(router *gin.RouterGroup, prov types.IPersitenceProvider) {
 		}
 		c.JSON(http.StatusOK, ItemsToDTOs(items))
 	})
-	router.POST("/item", func(c *gin.Context) {})
-	router.PUT("/item", func(c *gin.Context) {})
-	router.DELETE("/item/:id", func(c *gin.Context) {})
-	router.GET("/link/:itemId/:userId", func(c *gin.Context) {})
+	router.POST("/item", func(c *gin.Context) {
+		var item struct {
+			message string
+		}
+		if err := c.BindJSON(&item); err != nil {
+			c.String(http.StatusBadRequest, err.Error())
+			return
+		}
+		prov.CreateItem(ItemDTO{message: item.message})
+		c.Status(200)
+	})
+	router.PUT("/item", func(c *gin.Context) {
+		var item ItemDTO
+		if err := c.BindJSON(&item); err != nil {
+			c.String(http.StatusBadRequest, err.Error())
+			return
+		}
+		if err := prov.UpdateItem(item); err != nil {
+			c.String(http.StatusInternalServerError, err.Error())
+			return
+		}
+		c.Status(200)
+	})
+	router.DELETE("/item/:id", func(c *gin.Context) {
+		id, err := strconv.Atoi(c.Param("id"))
+		if err != nil {
+			c.String(404, err.Error())
+			return
+		}
+		if err := prov.DeleteItem(ItemDTO{id: id}); err != nil {
+			c.String(404, err.Error())
+			return
+		}
+		c.Status(200)
+	})
+	router.GET("/link/:itemId/:userId", func(c *gin.Context) {
+		itemId, err := strconv.Atoi(c.Param("itemId"))
+		if err != nil {
+			c.String(404, err.Error())
+			return
+		}
+		userId, err := strconv.Atoi(c.Param("userId"))
+		if err != nil {
+			c.String(404, err.Error())
+			return
+		}
+		if err := prov.Link(UserDTO{id: userId}, ItemDTO{id: itemId}); err != nil {
+			c.String(404, err.Error())
+			return
+		}
+		c.Status(200)
+	})
+	router.POST("/user", func(c *gin.Context) {
+		var user struct {
+			id int
+		}
+		if err := c.BindJSON(&user); err != nil {
+			c.String(http.StatusBadRequest, err.Error())
+			return
+		}
+		prov.CreateUser(UserDTO{user.id})
+		c.Status(200)
+	})
 }
diff --git a/internal/implementations/MemoryProvider.go b/internal/implementations/MemoryProvider.go
index b4ff513..890f231 100644
--- a/internal/implementations/MemoryProvider.go
+++ b/internal/implementations/MemoryProvider.go
@@ -19,10 +19,6 @@ func (item Item) GetMessage() string {
 	return item.message
 }
 
-type User struct {
-	id int
-}
-
 type MemoryProvider struct {
 	index        int
 	items        []Item
@@ -89,3 +85,16 @@ func (prov MemoryProvider) Link(user types.IUser, item types.IItem) error {
 	prov.itemsByUsers[user.GetId()] = append(prov.itemsByUsers[user.GetId()], storedItem)
 	return nil
 }
+
+func (prov MemoryProvider) DeleteItem(item types.IItem) error {
+	storedItem, err := prov.GetItemPtr(item.GetId())
+	if err != nil {
+		return err
+	}
+	storedItem.deleted = true
+	return nil
+}
+
+func (prov MemoryProvider) CreateUser(user types.IUser) error {
+	return nil
+}
diff --git a/internal/types/IPersistentProvider.go b/internal/types/IPersistentProvider.go
index ee6f25b..652b3ef 100644
--- a/internal/types/IPersistentProvider.go
+++ b/internal/types/IPersistentProvider.go
@@ -7,4 +7,6 @@ type IPersitenceProvider interface {
 	GetItemByUser(user IUser) ([]IItem, error)
 	GetAllItems() ([]IItem, error)
 	Link(user IUser, item IItem) error
+	DeleteItem(item IItem) error
+	CreateUser(user IUser) error
 }