Add API key GIF to JustCall provider guide

Author: ejoo

src/images/provider-guides/justcall-api-key.gif

@@ -43,7 +43,9 @@ To integrate with JustCall:
 ## Creating an API key for JustCall
 
 1. Log in to your [JustCall account](https://app.justcall.io/).
-2. Navigate to **Settings** > **API Keys** (or go directly to [API Settings](https://app.justcall.io/app/settings/api)).
-3. Generate a new API key and secret pair.
+2. Click on your profile icon, then navigate to **API and Webhooks** (or go directly to [API Settings](https://app.justcall.io/app/settings/api)).
+3. Copy your existing API key and secret, or generate a new pair.
+
+![JustCall API Key](/images/provider-guides/justcall-api-key.gif)
 
 For more details, see the [JustCall Authentication documentation](https://developer.justcall.io/reference/authentication).