Typing a 16 digit card number is annoying, and by making yourself type it every time will force you to think about the item you are purchasing more.  

If you plan on doing showing yourself remotely, you may also want to invest in a few digital items (lock or even camera). 

Having said that, there are still some great options out there which may be able to help you keep everything in one place (listing the property to 10+ major rental listing sites, managing listing responses + scheduling viewing times, tenant screening w/ a fully comprehensive application, digital lease creation, online rent collection, and maintenance request tracking).