Ask HN: How to integrate billing *and accounting* in our service?

We're already using stripe and we like it. We're charging our customers and we're happy about it. My question is related to accounting and billing.

What we need is to generate an invoice every month for our customers, make it available for them in their profile (myservice.com/billing), receive their payments, send them a receipt AND integrate that in our own accounting service (that'd count as revenue).

The only accounting software I've seen that has an API is Quickbooks. Wave (the one we currently use) has a closed alpha API. We're doing everything by hand at the moment. It shouldn't be that complicated, right?

Thanks!