call POST API function passing binary data

[ccfrusano]

Hello,
I'm trying to implement the TinyPNG API, to compress images: https://tinypng.com/developers/reference

I haves images in my system which I'd like to be compressed, and I should work directly with the binary information of the image:

My question is: How can I work with binary data? I only see the option to pass the body as a JSON, which would not fit for this purpose.

Thanks in advanced,
Carlos