Google last month launched an API for DV360. According to Google, the DV360 API enable developers to automate complex Display & Video 360 workflows, such as creating insertion orders and setting targeting options for individual line items.
The API enable advertisers to create advertisers, campaigns, creatives, insertion orders, and line items.
The Display & Video 360 API is built on HTTP and JSON. The V1 was launched on 27th March, 2020.