We have finalized API support for product images. There is a new endpoint Product images insert. Within the request you can submit multiple images for one product. Because image upload and processing can take longer time, the processing is asynchronous. Asynchronous processing is new to our API and it is described in detail on a separate page Asynchronous requests. Although you will probably use this endpoint for common product images, 360° images can be uploaded, too.
It is also possible to change one particular image by endpoint Product image source update. It is no loner necesary to do this manually or to delete and upload all images. Your modifications can be much faster and precise.