Booking and voucher Automation

Good Day

I have a travel site where I am selling scheduled destinations in Africa. I would like to find out if there is a plugin I can use where after a client has booked and paid, a travel voucher is emailed automatically to the client.
The client is paying through Paypal. After this is done, I would like the client to request a voucher….is there a plugin for this?

Here is a link to the booking engine
https://www.shabahatravel.com/bookings/

Thanks
D