Apple has announced it will expand its mobile payment platform to Canada by the end of the year, but the service is only available to Canadians with American Express credit cards.

Apple Pay allows iPhone 6 users to link a credit card to the service and make purchases with their smartphones.

During an earnings call on Tuesday afternoon, Apple CEO Tim Cook said Apple Pay will be available to eligible American Express customers in Australia and Canada this year. The company plans to expand Apple Pay to Singapore, Hong Kong and Spain in 2016.

During the call, Cook said since its launch in the fall of 2014, Apple Pay is seeing "double-digit growth in transactions" month after month and noted that Starbucks will support Apple Pay in its U.S. stores in 2016.

American Express announced that customer will be able to use Apple Pay with their iPhone or Apple Watch in stores with terminals that accept contactless payments and American Express cards.

Scotiabank is currently the only Canadian bank to offer American Express cards.

"We believe it is critical to be on the forefront of seamless and innovative payment solutions for our card members and we are pleased to be able to deliver on that with Apple Pay," Tony Prentice, vice-president of mobile products and payments for American Express, said in a news statement.