Looking for efficient billing options for my SaaS app.
Having never set this up before I am interested to hear what solutions others have used.
My billing will be based on the Tenant's number of users each month so hopefully it will vary (increase over time is good, right?)... ie Billed Amount = Rate X Number of Users
I have considered Paypal but seems like changing the amount billed each month for a recurring payment is complex (cannot even work out if it is possible)
Alternatively, had a look at BillingStreet.com but not sure if their API (http://billingstreet.com/api/) is usable with Aware IM.
Any guidance or suggestions from those who may have already done all this type of stuff would be really appreciated please.