update copy for thirdweb payments webhook secret key

docs/onboarding/22 NFT Checkouts/1b Advanced Guides/0 Webhooks.mdx

@@ -138,7 +138,7 @@ Do not provide a `localhost` URL to test your local server. We recommend testing
 
 To ensure the request came from thirdweb, each webhook request signs the payload and provides this signature in the `x-thirdweb-signature` header.
 
-To verify this signature, create a **SHA-256 HMAC hash** with your **thirdweb payments secret key** ([here](https://thirdweb.com/dashboard/payments/settings))and the **body payload as the message** (as a JSON-encoded string).
+To verify this signature, create a **SHA-256 HMAC hash** with your **thirdweb payments secret key** that can be found in the thirdweb dashboard [payments settings](https://thirdweb.com/dashboard/payments/settings) and the **body payload as the message** (as a JSON-encoded string).
 
 ### Example implementation