Does anybody know best & automatic way to accept rent from tenant

Hi, does anybody know what can be done to accept payments from 40 tenants electronically and automatically?

I have a lot of tenants and changing a property manager. My accountant deposits checks in the bank, but this is such a waste of time. What would be the better way?

I have several people that my Co pays through billpay every month. Wondering if I receive payments from tenants via billpay, how would I know which payment is from whom because we have a lot of payments from tenants that are the same $ amount.

I'm sure there is a better way doing that than making deposits at the bank or with smart phone