API Product Create

Hi, hope this is the right place for this.

I am writing some code using the REST API for Woocommerce to add new products.

All is well, except that I cannot get the image to load in the correct place – the image loads, but it appears under “additional images” rather than the product image.

This is the snippet that loads the image into the parameters file:

$image = $this->API_setProductImage($partnumber);
        $this->product_array['images'][0]['src'] = $image;
        $this->product_array['images']['position'] = 0;

I have tried various options for this but no luck – anyone else had this or can tell me where I am going wrong?

Thanks
Dennis