Amazon.com will start managing subscription payments for start-ups and other companies - the latest in a series of quiet moves the e-commerce giant has made into PayPal's turf over the past year.

The service, which launches on Monday, allows the company's more than 240 million active users to use credit card details stored on Amazon.com to pay for services such as a monthly phone bill or a digital music subscription. Amazon then charges a fee on each transaction.