They also don't have a open API which means you can't syndicate with other software's like tenant screening automation, etc as you grow.

You would have to either live close by for easy check in and out or try to find an semi automated way to do it.

This means you have a series of applications, workflows, processes (both manual and automated) and people that facilitate the operations of your business. 

I am not speaking about bypassing the wholesaler altogether, after all, they were instrumental in facilitating the deal, but rather obtaining more information to make an informed decision as you purchase.Please, chime in - whether you are a wholesaler or an investor, I’d love to hear both sides.Thanks in advance!

The note is a negotiable instrument between you and the bank. 

They e-mailed me an automated receipt confirmation.Anything else I need to do?

Many are fans of financial calculators, most folks in finance own the old reliable BA II from Texas Instrument, although there are other brands.

You might want to use an online rent collection utility to automate the process:  automatic ACH deposits to save trips to the bank, late fee management and rent reminders.

A standard promissory note and mortgage instrument do not usually include a prepayment penalty.

I also automate everything, doorlocks, thermostats, cleaning, bill pay etc. good luck