Hi there,
My name is Dev Tyagi, I'm a freelance web developer with 8 year experience in the industry, I've built various wordpress website which includes a payment gateway, you need to have a firm registration whether it's a llc, pvt ltd or proprietorship firm, once you've a registered business you can apply for payment gateway I can help you build a great selling website, if you want to speak on call I'm available to speak on phone, this is not a copy pasted template as people are doing today :) let me know if there's anything I can help you with.
Looking forward to work with you.
Thanks,
Regards,
DEv