If the taxi does accept credit cards then ensure that you have a visa card as all credit card terminals will process visa (and usually MasterCard) AMEX is not generally accepted as this requires a special contract with the credit card supplier.
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All vehicles accept payment by credit card and can also be paid in cash (taxi drivers are required to have coins in sufficient quantity to facilitate change to the user up to the amount of 20 euros). It should be noted that some taxis have wifi service available to passengers.
Taxis generally offer payment terminals to customers, which allow you to swipe a credit or debit card when your ride is over. You can opt to add a tip and request a printed receipt.
Tipping in Spain is rare, but doing so in a taxi is practically nonexistent. You may leave a tip if the driver helped you with your luggage or rushed frantically so you wouldn't miss your flight. Other than these extraordinary situations, just don't tip.