Advice please

Hey everyone! It's been 14 years since I last visited India, and I'm a bit clueless about what’s happening there now. I'll be coming to Surat for a week, so I would appreciate your suggestions for the best places to shop for books, jewelry, clothes, and have some food! Also, I’m curious about whether Apple Pay works there. If not, what alternatives can I use for my 15-day stay? Lastly, if anyone is free and would like to explore the city together, let’s hang out!