Every time a new request is made, this app helps in managing fulfillment.
At checkout, the app displays shipment estimates.
You don't need to worry about inventory management the app takes care of it.
Sendbox: Ecommerce Fulfillment uses the Sendbox shipping and warehousing API to handle shipping, fulfillment, and inventory management for your store.
Using this app makes controlling your store’s inventory much simpler.
By allowing the app to handle the fulfillment of your orders, you can also benefit from the fulfillment service on the app.
Sendbox handles the shipping quotes during checkout; you can get quotes to any country by using the Sendbox Shipping API.
api credentials - settings page
manage inventory - product page
shipping quotes at checkout