Stripe. That's what I use, I have no affiliation with the plug-in I'm a user of the plug-in and what I do is I have links on my website that lead to individual calendars for each service for example one area to one Airport leads to One calendar One area to another airport leads to another calendar after those calendars appointment has been booked it then goes to a specific stripe payment option you can see an example at Waxahachie taxi.com click the book now option I do not use PayPal at all I hope this helps