I apologize in advance for my ignorance when it comes to this subject as I am not a developer.
I would like to know if it is possible to develop a private app as a pass through to on-demand products that I could add to stores I create which would allow me to take cut of profit by raising the pricing as a middle man/web master? This would also allow me to be looked at as a single vendor to large POD companies giving me better discount pricing for me and my customers.
Customers Shopify > My Private App > Printful, Cafe Press Ect...
Any help would be much appreciated.
Interesting! So you are looking to link your own "middleman" storefront content to Shopify online stores? That certainly is possible, as well as your "middleman" site living inside a Shopify online store (e.g. - an IFrame). Here are a few links to start taking a peek. Hope this helps!