Vapi is the Voice AI platform for developers.

Vapi AI

Having trouble with Initializing the call - Tried using both Public and private keys -- Facing 400,401 or 404 errors -- It keeps on loop with these 3 -- After entering a phone number - I'm not getting the call - can you please help?
#buildwithvapi

**Make sure you are using your _Public API key_ (not the private key) when initializing the Vapi client in your web app.** For example:

```js
import Vapi from '@vapi-ai/web';
const vapi = new Vapi('YOUR_PUBLIC_API_KEY');
```

Double-check that your assistant and phone number are set up and active in the Vapi dashboard. Using the wrong key or an invalid assistant/phone number can cause 400/401/404 errors.

Sources:
- [Vapi Web SDK Documentation](https://docs.vapi.ai/sdk/web)
- [Vapi Quickstart Guide](https://docs.vapi.ai/quickstart/dashboard)

Used public key - getting 400 error, used private key - getting 401 error

Sorry my bad -- haven't initiated a workflow yet -- I just created a test phone number and I've my project settings -- Do I need to create workflow ID before I start testing calls out?

You need to create and assign a workflow assistant to your phone number before testing calls without it, the call won’t work and you’ll see 400/401/404 errors. Make sure you’re using the correct assistant Id, phoneNumber Id, and a valid API key in your request..