Use cash. Do not complicate matters with credit card. Cash is the default method for most things and especially if it's a small amount. There is actually no need for Grab in Bangkok as there are many taxis.
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Effective 6 June 2022, GrabPay cash-in transactions made through 7-Eleven stores will be subject to an additional two-percent (2%) convenience fee.
Tipping is NOT customary in Thailand, there is absolutely NO mandatory requirement to tip anyone, but small gratuities for great service are very much appreciated. Unlike some other parts of the world, you will never see a Thai service provider with his hand out waiting for a tip.
In Bangkok, I took a grab taxi for short distance driven by a lady, price was almost doubled showed up in their app and the car was dirty inside with food containers and make up items lady uses at the front seat.
Uber offers charges based on distance and time that customers take to travel, along with base fare whereas GrabCar charges a fixed rate basic which means you do not have to worry about getting shocked when you arrive at your destination.
What is GrabPay? Cashless payment, the easy and convenient way to pay your transactions. Simply link your debit/credit card or top up through GrabPay Wallet.
Many Thais will tip at these kind of places. Although, again, this isn't a fixed amount and it's just as much for convenience as it is for gratitude or a comment on the quality. Assuming the food is good and your server are pleasant, the small tip will either be a small banknote – 20 Baht being the most common.