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hello , i am working on my graduation project and it will be a web application of management , and i need a system of invoicing (creation - calculation - pdf printing ... )so i am asking if you know any gem can help in this case or any open source solution ? , thank you for help
thank you vincent , but my need is a system of invoicing not just the final step of payement , i need like a manager of invoice from creation to printing , thank you for help dear