Good question! Yes, you can certainly still sync to Google Calendar even with a regular gmail account. No Google Workspace or Google Suite account is required, though these are still compatible too.
Yes, the Pro and Business editions include a Stripe and PayPal integration: simplyscheduleappointments.com/guides/adding-payments-to-appointment-types/ You could also integrate with Gravity Forms and accept payment though their gateways as well: simplyscheduleappointments.com/guides/charging-varying-prices-with-gravity-forms-2/ If you have more questions, feel free to contact us too :) simplyscheduleappointments.com/contact/