diff --git a/src/db/mongo-adapter.ts b/src/db/mongo-adapter.ts
new file mode 100644
index 0000000..e9a517b
--- /dev/null
+++ b/src/db/mongo-adapter.ts
@@ -0,0 +1,9 @@
+import { MongoClient } from "mongodb";
+
+const client = new MongoClient(process.env.MONGO_URI!);
+client.connect();
+
+export async function insertPayment(amount: number, userId: string) {
+  const db = client.db("paylink");
+  return db.collection("payments").insertOne({ amount, userId, createdAt: new Date() });
+}