Help with payment processing company

[Jonathan Sibley]

First time poster here looking for a little help with some management systems.... I apologize if this is common knowledge. I am looking for a service to process rental payments for 22 units. I now have 11 duplexes after adding 6 over the last couple of months. 5 duplexes (10 units) that I acquired last month were under a lease that required payment through paylease.com and I really like that idea. The first 10 units I acquired were not very well suited for this when I purchased them, but I believe they are more stable now and I could implement this across most of the units. One small wrinkle is that about 3-4 units have been rented to tenants who receive assistant from some non-profit veteran and mental health services groups (to be clear 2 separate groups, one veteran, one mental health). These could not be put on a required online pay, but I believe I can include a requirement to pay online for all of the private pay tenants.

My problem is that it appears pay lease won't accept accounts under 100 units (per the email I got from their website after requesting info). I am still trying to confirm this, but I was hoping to get ideas to compare all the options available.  Update, I confirmed that they only take customers with over 100 units.  Any companies that accept payments for fewer units?