The skins got converted to extra skins, which you can use them for trade ups.
#Didn’t got blue credits for duplicates.
hybrid briar
leaden urchin
When trading a duplicate, yes your skin will affect it. Because that's what you are trading
Sorry to hear that, but it happens to humans do make mistake sorry to say
It's okay, you will get it back in the future, now let's close this conversation
Unfortunately, he is helper, and we do make mistakes
We can't be right everytime
leaden urchin
There is nothing to do now, lets end this conversation
Blacky made a mistake, it happens he is human just like us
lapis spindle
if u have 2 of them, now pls calm down 
true tartan
there's no scam here, watch your tone
everything worked as expected
you are
anyway, the original question is answered: there are no more blue credits to be obtained since you have trade up, as per patch notes, etc
you can read about it in our patch notes how it works
that is all