Rent Collection Tool

[McKay Moore]

I'm looking for a more convenient way to collect rent that will accept cash. My tenants (less than 5 units) usually pay with a money order in person, but I'd like to have another option that also doesn't require a bank account. 

It would be great if they could have the option of reporting to credit bureaus to increase their credit score. 

I have systems that I like for everything else, so I don't care about applications, leases, background checks, etc. I JUST want a payment collection tool. Does that exist?