To push orders to multiple marketplaces (including AliExpress, Amazon, Walmart, etc.), we will be using Zinc.io. Zinc is an order placement API and allows us to automate orders.
Since Zinc is it's own service, you will have to sign-up for an account here. Once signed up, you will get an API key that you can enter here under Development. Once this is entered, you will be able to search and place respective orders.
Please note that Zinc charges $0.01 per product search and $1 per order. Volume pricing is available through them. Openship is also working on a managed service for users directly.
If you are already using Zinc, we are offering free marketplace integration so your products can be listed on the Openship Marketplace. Please get in touch if interested.