Private Exchange - Holding XRP

[SPEAR]

Hello all,

I am currently in the midst of building a Private Exchange to support the buying of XRP via non-wire transfer capabilities e.g. Paypal, Credit Cards etc

I'm very comfortable with all aspects of the Ripple API setup, but one thing I'm not sure about is procuring and holding large amounts of XRP (as stock) to allow customers to purchase. 

Can anyone shed any light into how this is achieved (institutional purchase? can it be real-time?) or is it just a simple matter of my company purchasing a large amount of XRP at the current market rate and transferring that into the company wallet ready to transfer over to customers wallet once purchased?

 

Many thanks in advance.