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Stripe Billing - A set of tools for billing and subscriptions
Bookipi Invoice App - A minimal, beautiful invoice app for freelancers
PayHere - Run a services business or startup? Charge recurring and one-off payments with beautifully designed payment forms. Get up and running in less than 5 minutes!
InvoiceApp - Beautiful online invoicing software for small businesses
Square Installments - An easy way to offer monthly payment plans to your customers
Billdogg - Beautifully simple invoicing for freelancers