Day 2 test airline discounts

[IamAporcupine]

Apologies in advance for the daft question

I am about to book my day 2 test for my return from Spain and found that some airlines have discount codes wuith some labs.
I tried one of the codes on the website and it worked. However, I am not actually flying with that airline - will this be a problem?!

I have not bought the test yet but I can't see anywhere where the booking reference with the airline is requested. The same lab offers discounts to several airlines (using different codes)

Does anyone know?
Thanks in advance!

I bought my lfd ones with qured and used the British airways discount despite I didn’t fly with them. I took the test yesterday and no problem
Flying tomorrow back and bought my day 2 using the ba discount. Doubt they do care tbh. Everything they care about is you have it

That's what I thought, thanks a lot!