diff --git a/app/cache/store.go b/app/cache/store.go
new file mode 100644
index 0000000..309333f
--- /dev/null
+++ b/app/cache/store.go
@@ -0,0 +1,15 @@
+package cache
+
+import "time"
+
+type Store interface {
+	// Set an item in the store.
+	Set(key string, value any, TTL time.Duration) error
+
+	// Get an item from the store.
+	// returns an error if key is not found or there is other problems.
+	Get(key string, value any) error
+
+	// Check if a key exist in the store.
+	Has(key string) bool
+}