What is the difference between the «Login with Amazon» and «Login and Pay with Amazon» terms?

«Login and Pay with Amazon» service combines Amazon’s long-standing «Amazon Payments» service with its relatively new «Login with Amazon» service to form a new one-stop-shop integration for web payments.

techcrunch.com/2013/10/08/amazons-pay-with-amazon-service-challenges-paypal-for-the-webs-payment-business

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