Passing categories and attributes

[SebastianAlvarez-Matesoft]

Hi, I'm having trouble with product creation. I can't figure out how to pass the categories and the attributes, it keeps showing "rest_invalid_param" error code with message "categories[0] not of type object". I first thought it should be an object array, but it didn't work. I also tried with a map, but there is no way to make it work. Could you please give me an example of how should I do it?