I have a TATL round trip this summer, paid with cash, and for reasons I will be cancelling the return leg of the trip.

I have been able to find very little info on this type of situation.
Some people claim I would get eCredits for less than half the trip, but no further information on how much, how they arrived to this conclusion, nor how does Delta decides how much to refund.

Anyone with some experience, post-Pandemic, has more details?