diff --git a/src/routes/links.ts b/src/routes/links.ts
index 01ebd71..05a6ad4 100644
--- a/src/routes/links.ts
+++ b/src/routes/links.ts
@@ -53,6 +53,7 @@ export async function resolveLinkTemplateId(
 const createLinkSchema = z.object({
   userId: z.string().uuid().optional(),
   templateId: z.string().uuid().optional(),
+  templateSlug: z.string().optional(),
   originalUrl: z.string().url().optional(),
   title: z.string().optional(),
   description: z.string().optional(),
@@ -219,7 +220,7 @@ export async function linkRoutes(fastify: FastifyInstance) {
     }
 
     const originalUrl = data.originalUrl || 'https://angkorlifes.com';
-    const resolvedTemplateId = await resolveLinkTemplateId(data.templateId, null);
+    const resolvedTemplateId = await resolveLinkTemplateId(data.templateId, data.templateSlug);
 
     const result = await db.query(
       `INSERT INTO links (
diff --git a/src/routes/sdk.event.test.ts b/src/routes/sdk.event.test.ts
index 51bffe5..05ff406 100644
--- a/src/routes/sdk.event.test.ts
+++ b/src/routes/sdk.event.test.ts
@@ -46,6 +46,9 @@ describe('POST /api/sdk/v1/links', () => {
   });
 
   it('accepts payloads without originalUrl and derives a fallback destination', async () => {
+    mockQuery.mockResolvedValueOnce({
+      rows: [{ id: 'default-template-id' }],
+    });
     mockQuery.mockResolvedValueOnce({
       rows: [{
         id: LINK_ID,
@@ -70,7 +73,7 @@ describe('POST /api/sdk/v1/links', () => {
       originalUrl: 'https://example.com/emoji/detail',
     });
 
-    const insertCall = mockQuery.mock.calls[0];
+    const insertCall = mockQuery.mock.calls[1];
     expect(insertCall[0]).toMatch(/INSERT INTO links/);
     expect(insertCall[1][3]).toBe('https://example.com/emoji/detail');
 
diff --git a/src/routes/sdk.ts b/src/routes/sdk.ts
index 7d0bd27..27e7880 100644
--- a/src/routes/sdk.ts
+++ b/src/routes/sdk.ts
@@ -60,6 +60,7 @@ export async function sdkRoutes(fastify: FastifyInstance) {
       attributionWindowHours: z.number().int().min(1).max(2160).optional(),
       expiresAt: z.string().datetime().optional(),
       templateId: z.string().uuid().optional(),
+      templateSlug: z.string().optional(),
       userId: z.string().uuid().optional(),
     });
 
@@ -67,7 +68,7 @@ export async function sdkRoutes(fastify: FastifyInstance) {
     const originalUrl = body.originalUrl || 'https://angkorlifes.com';
 
     const shortCode = body.customCode || 'sdk-link';
-    const resolvedTemplateId = await resolveLinkTemplateId(body.templateId, null);
+    const resolvedTemplateId = await resolveLinkTemplateId(body.templateId, body.templateSlug);
 
     const result = await db.query(
       `INSERT INTO links (