The project cost will be around 150K-200K INR for integrating already available payment gateway. But if you want your own solution then it will be between $1-5Million depending on your features. We recommend Ruby or Java for this solution. We can work out an end to end solution and very high quality output for your project. We have delivered more than 50 High end solutions. We can also be your long term development and solutions partner providing cost effective and quality delivery for projects or outsourced Developers.
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Regards, Ganesh Bhat