Please, make split payment option a thing

Hello!
I’m just curious why it hasn’t been done yet. I mean, we are in 2020 afterall.
I’m writing this just because I’m missing only about 0.46€ to pay for my thingy, but I can’t. And I’m deffo not buying another 10€ just to be in the same position later on.

Please Blizz, it’s so simple.