Redirecto to url with parameters after login

RouterOS Beginner Basics
1

I need to redirect to user to whatsapp using the api

https://api.whatsapp.com/send?phone

How can i send a extra param

http://example.xyz/login?dst=https://api.whatsapp.com/send?phone=54213412343&text=asdfasdfasdfasdf&username=T-30%3A99%3A35%3A83%3A71%3AE8&popup=false

The problem is that text=asdfasdfasdfasdf, it is deleted by the router.
After the login, the router redirect to the user to https://api.whatsapp.com/send?phone=54213412343
and not to https://api.whatsapp.com/send?phone=54213412343&text=asdfasdfasdfasdf

Is there a solution to this?
Ty.