feat: add zapier support

packages/lib/server-only/public-api/test-credentials.ts

@@ -0,0 +1,19 @@
+import type { NextApiRequest, NextApiResponse } from 'next';
+
+import { validateApiToken } from '@documenso/lib/server-only/webhooks/zapier/validateApiToken';
+
+export const testCredentialsHandler = async (req: NextApiRequest, res: NextApiResponse) => {
+  try {
+    const { authorization } = req.headers;
+    const user = await validateApiToken({ authorization });
+
+    return res.status(200).json({
+      username: user.name,
+      email: user.email,
+    });
+  } catch (err) {
+    return res.status(500).json({
+      message: 'Internal Server Error',
+    });
+  }
+};