Login to WaChat Dashboard https://dashboard.wachat.net/login
and click to My Apps option from sidebar
After successfully create app, Click on REST API from your app.
Now you can find the app key and auth key. Copy the app key and auth key to use for app integration
Regenerate Auth Key
You can regenerate auth key from sidebar Wachat AuthKey or click here https://dashboard.wachat.net/user/auth-key