You’re not missing anything. This product is VERY minimal right now. Check out all the feature requests and you’ll get a picture of all the things it is currently missing:
https://support.wix.com/en/apps-made-by-wix/paid-plans
Also, trying to work Corvid into Paid Plans is not an easy or great solution. If you need added functionality NOW for a recurring payment system, you’re best off working with a third party like PayWhirl or Subbly,