Getting tenants to pay online versus in person

Wondering if any landlord/property manager out there has had luck getting tenants to pay solely online versus dropping rent payments off in office/mailing payments. 

Our company is trying to minimize the amount of rental payments brought into the office. 

A few methods that we have started using and implementing are as the following: 

1. Helping tenants set up their online payments through the tenant web portal at move-in

2. At renewal time, I bring up the online payment and try to get them to set up then.

3. Sending out a letter outlining the benefits of using the portal with step-by-step directions to use the online payment through their portal 

4. Charging a $5 convenience fee for any money order or check dropped off in office

Anyone have any other advice or suggestions?