I am looking for wordpress payment integration plugin for my site to help my customers or users to checkout their items easily.

Here's the text from what looks to be your writing elsewhere:
"Here's are top three appointment booking plugins for wordpress website.

  1. Gravity Booking:
    Gravity Bookings works perfectly for any business that relies on an appointment calendar. Manage your client appointments within Gravity Forms using Google Calendar.

  2. Start Booking:
    It is very easy to use and allows you to quickly set up appointment and booking forms and add them to your website.

  3. Booking Calender:
    Booking Calendar plugin enable awesome booking system for your site. Simply show availability and receive bookings for your property or service in easy to use booking system with clean and smooth interface.
    "

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