Howto encrypt your request string?

I have a booking application in which I send an email to a customer
with a link with which they can cancel a reservation. The link contains
a reservation number. I would like to hide the plain-text reservation
number in this link, because, in plain-text, it gives people an
opportunity to mess with it: copy-and-paste this link into a browser
and alter the reservation number, and then submit it.

Is there a way you can encrypt/decrypt the request string?

Thanks

.

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