I have two DishNow receivers. One, I'll call "US", is for domestic programming and the other, I'll call "BR", is for international programming.
Both receivers were purchased this year and have Orange & Yellow smart cards.
Both receivers are connected to a DPP Twin 119, 110 and 61.5. (Nonstandard configuration for DishNow.)
Today (12/30):
I purchased a new GreenDot MoneyPak. (Old one was empty)
I was able to add a day to the BR receiver. It had a number of days remaining but I wanted to see if it worked first.
I was able to add AT200 to the US receiver. It had run out of days over a week ago.
Additionally:
I did have problems adding days the last time (mid-December) I tried to add to the US receiver. The system had a problem and transferred me to a CSR. I made the mistake of giving my GreenDot MoneyPak to the CSR. They had problems while I was on the line but after we gave up my MoneyPak balance went to zero and it appeared to have been added, in full, to the receiver. Fortunately it was only a couple days but I won't make that mistake again.
Typically I only add US programming when I'll watch something, the occasional weekday and weekend. I don't dare let the BR system run out of days... at least until "A Favorita" ends.