diff --git a/lib/borders.js b/lib/borders.js
index c6945b1..a0b71e4 100644
--- a/lib/borders.js
+++ b/lib/borders.js
@@ -33,11 +33,39 @@ export const getUserBorders = async (req) => {
   return result;
 };
 
+export const setUserBorder = async (req, borderId) => {
+  const session = await getSession({ req });
+  if (!session) {
+    return undefined;
+  }
+
+  const accountData = await prisma.account.findFirst({
+    where: {
+      userId: session.user.id,
+    },
+  });
+
+  const updateData = await prisma.applicationUserData.upsert({
+    create: {
+      userId: session.user.id,
+      discordId: accountData.providerAccountId,
+      borderId,
+    },
+    data: {
+      borderId,
+    },
+    where: {
+      userId: session.user.id,
+    },
+  });
+  return updateData;
+};
+
 export const getByDiscordId = async (id) => {
   const userData = await prisma.applicationUserData.findUnique({
     where: {
       discordId: id,
     },
   });
-  return userData ? `${userData.borderId}` : undefined;
+  return userData?.borderId ? `${userData.borderId}` : undefined;
 };