diff --git a/handler/handler.go b/handler/handler.go
index 2262d70..698e5a7 100644
--- a/handler/handler.go
+++ b/handler/handler.go
@@ -3,9 +3,11 @@ package handler
 import (
 	"encoding/json"
 	"fmt"
+	"io"
 	"net/http"
 	"time"
 
+	"code.ewintr.nl/planner/planner"
 	"code.ewintr.nl/planner/storage"
 )
 
@@ -13,36 +15,76 @@ func Index(w http.ResponseWriter, r *http.Request) {
 	fmt.Fprint(w, `{"status":"ok"}`)
 }
 
+type ChangeSummary struct {
+	Updated []planner.Syncable
+	Deleted []string
+}
+
 func NewSyncHandler(mem storage.Syncer) func(w http.ResponseWriter, r *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
-		timestamp := time.Time{}
-		tsStr := r.URL.Query().Get("ts")
-		if tsStr != "" {
-			var err error
-			if timestamp, err = time.Parse(time.RFC3339, tsStr); err != nil {
+		switch r.Method {
+		case http.MethodGet:
+			timestamp := time.Time{}
+			tsStr := r.URL.Query().Get("ts")
+			if tsStr != "" {
+				var err error
+				if timestamp, err = time.Parse(time.RFC3339, tsStr); err != nil {
+					http.Error(w, err.Error(), http.StatusBadRequest)
+					return
+				}
+			}
+
+			items, err := mem.Updated(timestamp)
+			if err != nil {
+				http.Error(w, err.Error(), http.StatusInternalServerError)
+				return
+			}
+
+			deleted, err := mem.Deleted(timestamp)
+			if err != nil {
+				http.Error(w, err.Error(), http.StatusInternalServerError)
+				return
+			}
+
+			result := ChangeSummary{
+				Updated: items,
+				Deleted: deleted,
+			}
+
+			body, err := json.Marshal(result)
+			if err != nil {
+				http.Error(w, err.Error(), http.StatusInternalServerError)
+				return
+			}
+
+			fmt.Fprint(w, string(body))
+
+		case http.MethodPost:
+			body, err := io.ReadAll(r.Body)
+			if err != nil {
 				http.Error(w, err.Error(), http.StatusBadRequest)
 				return
 			}
-		}
+			defer r.Body.Close()
 
-		items, err := mem.Updated(timestamp)
-		if err != nil {
-			http.Error(w, err.Error(), http.StatusInternalServerError)
-			return
-		}
+			var changes ChangeSummary
+			if err := json.Unmarshal(body, changes); err != nil {
+				http.Error(w, err.Error(), http.StatusBadRequest)
+			}
 
-		body, err := json.Marshal(items)
-		if err != nil {
-			http.Error(w, err.Error(), http.StatusInternalServerError)
-			return
+			for _, updated := range changes.Updated {
+				if err := mem.Update(updated); err != nil {
+					http.Error(w, err.Error(), http.StatusInternalServerError)
+					return
+				}
+			}
+			for _, deleted := range changes.Deleted {
+				if err := mem.Delete(deleted); err != nil {
+					http.Error(w, err.Error(), http.StatusInternalServerError)
+					return
+				}
+			}
+			w.WriteHeader(http.StatusNoContent)
 		}
-
-		fmt.Fprint(w, string(body))
-	}
-}
-
-func NewStoreHandler(mem storage.Syncer) func(w http.ResponseWriter, r *http.Request) {
-	return func(w http.ResponseWriter, r *http.Request) {
-
 	}
 }