Which is the best way of checkout for online shopping?

Credit cards with generous cashback are best. Good examples would either be the UOB Absolute Cashback (1.7% unlimited cashback, no min. spend), or the AMEX True Cashback (1.5% unlimited cashback, no min. spend). Both have almost no restrictions on purchases which are eligible for cashback.

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You don't gain much by using a debit card. Some people only use debit cards as a form of financial discipline, because the amount is deducted immediately from your account. Of course, if you're going to overspend, you'll do it whether you have a credit or debit card.

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Check out these top corporate credit cards if you're running a business: https://www.providecover.com/12-best-sme-credit...