So I think I have found a solution (unless I go with residentresearch.com.. thanks @Account Closed!)
I need to automate the process where the tenant fills out an application and a PDF is generated and a $50 fee is paid:
I'll make a low-cost wordpress site (about $50 per year) that has two pages:
Homepage: rental ad for the property. Lists the features, rental cost, pictures, etc. At the bottom of the page, there will be a big blue button that says "APPLY NOW", which takes them to the application page.
Application page: This is where the tenant can enter his/her name, address, SSN, residential history, employment history, etc. They can upload copies of their driver's license and paystubs. At the bottom is a button that says "SUBMIT - $50", which takes them to my Intuit Payment Network checkout screen. The data from the form is sent to GravityPDF, which is a Wordpress plug-in that generates PDFs. The PDF is emailed to me and the tenant.
Intuit Payment Network checkout screen: Simply checkout screen that charges $50, paid by credit, debit, or bank ACH transfer.
Once I get the $50 payment, I send off the PDF to NTNonline.com, and they give me a report within 48 hours.
If you're curious about GravityPDF, you can try their demo here:
https://gravitypdf.com/#GFdemo