1: In case of a payed license you need to notify us and show us that same licence. You can contact me in discord for that purpose.
2: You don't have to credit Pixabay, crediting is not the same thing as sourcing... Look at it like this.. If the image is not yours you need to source it (link it) to the page where you got it from in the first place, otherwise there will be no way for us to confirm that it is indeed a free image.