The best alternatives to Oopy are Stripe, involve.me, and Chargebee. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
Revloop is an API-based, multi-tenant SaaS billing solution, fully hosted and run in the cloud. Our goal is to help launch the next wave of subscription and related services. No matter what your product or pricing structure, we can bill for it.