On VRBO/HomeAway you can add the agreement .pdf to your listing and the renter is signing it electronically when they book.  

I want to do some sort of electronic payment method.

These units as something like 10" to 12" high, about 8 " deep, and from 4' to 5' long and are an electronically controled, actually a nice and attractive feature.

If you can find an electronic version of the book in a format that can be copied (e.g., pdf version), then you could cut and paste the documents.Contrary to what the author states in the book, I have been told here on BP that a real estate license is required to buy and sell options (at least in Massachusetts). 

So, add that expense to your list as wellOur lease signing is legally binding electronic documentation that is e-signed and verified by both tenants AND landlords.

I handle most everything... collecting payments electronically, determining lease amounts, fielding any questions... so I feel pretty confident that a "PM a-la-carte" type of situation is what I'm after and would work best for me.

I was thinking about requiring my guests to sign my own rental agreement in addition to Airbnb or VRBO’s agreement either by email or by using ownerrez or docusign to send them electronically.

@Kelcee LuceroAre you looking at paper or electronic? 

A couple years ago I instituted a pay rent by electronic funds transfer only policy and haven't had a late fee since.

Your posting didn't say where in South Carolina you were buying, so here are links to a directory of Landlord Associations around the state and the National REIA directory:https://www.thelpa.com/lpa/associations/south-carolina.htmlhttps://nationalreia.org/find-a-reia/For everything else I use: https://www.apartments.com/-It allows you to accept electronic rental payments.