According to the information provided at Shopify Community, you can get Shopify payment gateway if your setup is in India. The gateway that you use to accept payment from your customers is based on your location, rather than where your customers are - so you'll want to make sure that your location is accurately set to India within your admin at Settings > General to prevent any errors.
However, Shopify Payments aren’t available in India. But you may try to use PayPal instead.
For further assistance please contact Shopify Customer Service at (888) 746-7439 (toll-free).