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Chargebee is the leading subscription billing software powering end-to-end recurring billing, subscription management & auto invoicing for 2000+ SaaS businesses
Stripe offers payment APIs for online businesses of all sizes. More than that, it features multiple other features such as business analytics, or virtual cards
Paymill is one of the top payment processing companies in Europe. As your payment service provider, Paymill will allow you to accept PayPal and credit/debit