Multi-Channel E-Commerce Drop Shipping Integration

We are a brand that sells our items online. We are opening up our products to be sold on other peoples websites. We are dropshipping orders from these other e-tailers websites from our fulfillment warehouse. We need the following services: Integrating into other e-commerce websites inventory or shopping systems to carry our products. We will be dropshipping the items sold as they sell to their customers, so the products need to be setup in their systems. Need to integrate our systems with theirs through our API. We use "StitchLabs" to track and manage all of our inventory. We need to configure it to pull order data for each sale from their website and send it through our system for dropship fulfillment.