Drop Shipping (Shopify to Shopify and Woocommerce to Shopify)

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We manufacturer a range of products and have been approached by 2 customers who want to drop ship our products.

One sells via Shopify and the other via Woocommerce

I've looked in the app store and all the drop shipping apps appear to be about selling stuff from Aliexpress etc on your site which clearly isn't relevant to us.

Does anyone know if there is a plug in / app / API that our customers can use to plug into our Shopify Plus store so they can sell our products via their sites?

Many thanks