You can 100% do that. The proper, supported way to detect free vs paying users is to use Apify’s built-in flag: APIFY_USER_IS_PAYING → accessible via Actor.getEnv().
That way you can confirm how userIsPaying behaves for free vs paying accounts without publishing or affecting your real product Actor. After you verify the behavior, just move the same logic into your main Actor.
const user = await Actor.apifyClient.user().get();isPayingUser = user.isPaying || false;
const user = await Actor.apifyClient.user().get();isPayingUser = user.isPaying || false;