Retrieves a package.
You must pass the ID of the Wix account that the package belongs to in the header of the call. The call fails, if the package and Wix account don't match.
Important: This call requires an account level API key and cannot be authenticated with the standard authorization header.
You can only call this method when authenticated as a Wix app or Wix user identity.
This method doesn't return any custom errors, but may return standard errors. Learn more about standard Wix errors.