# Signing the URL

The Pay Widget is configured by URL query parameters. 

As the first step, you need to provide 2 params in the URL that will identify your merchant in our system:

1. <mark style="color:yellow;">**source**</mark> - the "source param" value from the merchant dashboard
2. <mark style="color:yellow;">**signature**</mark> - the JWT token generated using the "URL signature secret" from the merchant dashboard

### Generating the signature

You must provide a unique **signature** parameter, which is a JWT token (HS256 encryption algorithm) generated using the "URL signature secret" value as a secret. You must add some unique value to the token payload to make each token unique because we don't allow creating more than 1 order using the same signature. During testing, you can generate a JWT signature using this website: <https://jwt.io/>. You can also provide URL configuration parameters in the JWT token payload.

An example of signature generation

```typescript
import * as jsonwebtoken from 'jsonwebtoken';
import { v4 as uuid } from 'uuid';

const signature = jsonwebtoken.sign(
    {
      uid: uuid(),
    },
    YOUR_SIGNATURE_SECRET,
    {
      algorithm: 'HS256',
    },
 );
```

After you have the source and the signature params, you can proceed to configure the widget with [URL params](/widget-integration/url-params.md)


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