How to implement such a redirect?

Question

Nginx

After a successful crutch

spoiler

server {
server_name 123456.ru www.123456.ru; Это домен на борту автомобиля
return 301 https://SITE-NAME-KUDA-PEREYTI.ru/index.php?pk_cam... это сайт куда надо перебросить посетителя

the idea came to track the transitions from mobile SMS business cards

The task is as follows:
1. After a telephone conversation with the client, the manager sends an SMS business card after him (the site is such and such, email, phone, NAME) - everything is fine, but how then to track the client if he did visit the site?
The first thing that came to my mind was to use it (as in a spoiler), but there is a nuance - to shine with a long link is not comme il faut,
I think to do this https://sitename/. - dot after the slash
.

Question - how correctly (like a spoiler) to enter this redirect?