How to integrate specific wholesalers as drop shippers?

[Queenofthesun]

Hello, 

I have several wholesalers that are interested in drop shipping through my shopify store, but I do not know how to integrate them? Which app would I use for placing orders that would send to my wholesalers directly? Most of the apps I am seeing work with a wide range of wholesalers I am not interested in.  Please help.