Always carry at least 2 cards, if not more!

I had my main card blocked many times while traveling. As @jcaron explained, it's common for card issuers to block your card as soon as you make a transaction in a new country. Then you need to get in touch with your bank to have it unblocked, which can be difficult if you're traveling to a country where you don't have data coverage and where public WiFi networks are rare.

A few month ago I even was in a situation were 2 of my cards were momentarily unavailable: the first one fell victim to skimming and the other one expired before I received the new card from my bank. Had I been abroad at the time, I could easily have had a third card blocked by an issuer. So if you can carry 3 or 4 cards, do it, that's not too many!

Since you're from Italy, you can get travel cards with no margin on exchange rates from N26 and bunq. You can also get cards that have a small margin on exchange rates from Revolut and TransferWise. All of these cards are free or cost only a small one-time fee, with no fees for inactivity, so they make good backup cards for your travels.

One of your cards should be a credit card

Your prepaid Mastercard should work for most transactions. I use my Revolut prepaid Visa all the time abroad.

However, some rental car companies and hotels only accept credit cards. Or accept debit cards and prepaid cards only in exchange for "debit card fees". I recommend you carry a credit card along with your prepaid card. I use bunq's Travel Card.

Deposits for hotel rooms and rental cars are much easier with a credit card, and some may not accept anything else than a credit card. Check before you go. https://travel-dealz.eu/blog/book-hotel-without-credit-card/

Prepaid usually won't work offline. It have happened to me twice in two-three years that the merchant's terminal didn't have any contact with the outside. At both times prepaid cards weren't accepted but credit cards were accepted. Cash is of course accepted on most destinations in this case but not all.

In answer to your actual specific question,

1. I am not from Italy but

2. I have frequently travelled to India from Europe, both short and long trips

3. I have never used, or taken, a credit card to India. Only debit cards.

Some thoughts,

• It's incredibly unlikely you'll be renting a car there.

• India is super-high-tech and mobile-oriented, so I've never had any problem using any sort of card at even smaller merchants. If you're coming from backwards Europe, or more-backwards USA, it's like stepping in to the future in terms of mobile use, connectivity etc. Think Indian programmers etc etc.

• You'll surely want some cash, and the best/only way to get that is very easily at the ATMs which are everywhere.

• For uber/similar (everyone uses those constantly), as I say I have only ever used/had debit cards.

• At more "Western" hotels, no issue. If you stay in a more "local" hotel (where local businesspeople stay) it's possible they simply only take cash, but, if they do take cards there is no difference between debit/credit. (I've never encountered one that only takes cash, not cards.)

Some folks have pointed out that, with cards, one sometimes gets that annoyance where the company will security ping you. Unfortunately, that is true anyway if you have 1, 10, 1000 cards on you - it's just one of the nuisances of life. (If you have more cards it's almost just more annoying.) I don't see it as anything to get worked up about; there's no solution to it. It sometimes happens, annoyingly, in your own country.

Tip: if arriving in Mumbai, do not take an uber from the airport. (It's perfectly ok to take an uber/whatever to the airport, but do not take one from the airport.) Just get some local paper currency from the many ATMs on arrival, and, walk downstairs and take a totally normal yellow taxi to town. You pay (cash) at a little desk and they put you in a yellow cab (the cost is a pittance). Otherwise, use ubers/whatever freely. Or indeed, just hail a cab on the street anytime, paying the small fares with cash.

caveat India is obviously enormous, and there is nobody existing who is familiar with all cities, or even regions, of India. I know zero about many whole "universes" of India. (Maybe question should be more region specific, IDK?)

Our Lady Lakshmi will bring you a prosperous trip!

(among other things she is the patron of the welfare & education of girls; so those who follow Lakshmi you may donate, say, books to a girl's school to honor Lakshmi. subsequently whenever I flew to India I'd donate 50 or 100 bucks to say a girl's orphanage. (easy to do online!) this has made me huge piles of money in Indian business, so, it works for me - thanks only to Lakshmi. Good luck!)

As other answers have pointed out, a second means of payment is necessary since some places only accept one of the major cards and not the other.

If you're using pre-paid cards it's not difficult to purchase a popular competitor's card too, only inconvenient to tie up the funds, but being caught without money is worse.

Also noted in some answers is the you might get an occasional call asking if it's you using the card, or you'll want to have a means to load more money or report a stolen card; and that's where an additional payment method becomes available.

• Contactless Payment

  Contactless payment systems are credit cards and debit cards, key fobs, smart cards, or other devices, including smartphones and other mobile devices, that use radio-frequency identification (RFID) or near field communication (NFC, e.g. Samsung Pay, Apple Pay, Google Pay, Fitbit Pay, or any bank mobile application that supports contactless) for making secure payments.

  You'll want to bring a phone, and much like your cards be certain not to lose it. Turn on and setup NFC payment using your phone. You can tap with your phone much the same as with a card, and the fingerprint scanner makes it fairly secure.

  • Apple Pay - Not available in India

  • Google Pay and Samsung Pay work in India
    On phones dfferent credit, debit and loyalty cards can be loaded into the app, and selected by swiping between them on-screen. Then you tap your phone, if the payment is over the limit you need to enter a PIN too.

By bringing a phone and setting up payments before you go (and contacting your payment sources) you'll have a backup source of funds and means to conduct your finances when you travel. Be aware that you might want to rent / purchase a second phone for travel as your phone's private contents may be subject to search by Customs.