Hi there, @chris12 and welcome to the Community 
Thank you so much for the feedback!
The functionalities you’ve mentioned aren’t supported now, but requests for them are already on the Wishlist. Please upvote them here:
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Payment through Stripe, Paypal or other services (this feature is already in the works)
Regarding the Pack plans, if you’d like to create several widgets of the same app, you just need to subscribe to a paid plain of the needed plan. I guess the Appointment Booking Pro plan, where you can create up to 9 Appointment Booking widgets, is the best option for your needs:
If you have any questions left, we’re always here to help 