All of my tenants pay electronically, so they have their own receipts.

We can manage everything electronically for all notices.

And here is probably the worst way to implement a payment system: https://www.biggerpockets.com/forums/52/topics/92015-warning-about-electronic-rent-collection

These are the folks who will receive a $4500 tax refund, then spend it within a week in the electronics section at WalMart. 

Yes, electronically where each signs and scans in the document. 

Eventually we found a product called Victor Electronic Mousetrap.

I would ask for the usual documents such as current leases, payment records, any three day notices issued, current tenant information, transfer of security deposit or reserves (you may be able to do this electronically or by check) along with their application and any estoppel certificates (signed document by tenant that their rent, security deposit, terms was this) if your state has those.

If the software is not simplifying your life or making you more accurate, you shouldn't use it.Software does have extremely helpful features like online payments, marketing syndication (click a button and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

This can affect your Tenants, potentially damaging their modern electronics. 

The IRS has new reporting guidelines in place that will require electronic payment platforms to repot your income as a 1099.