seanlane

I found my issue. For product variations, the property I was attempting to set was images, like for the product itself, but I should have been using image. For example:

Incorrect example:

var_data = {
    "variations": [
        {
            "id": var_id,
            "images": [image_data[2]]
        }
    ]
}

Correct example:

var_data = {
    "variations": [
        {
            "id": var_id,
            "image": [image_data[2]]
        }
    ]
}