A payment plan designed for sending campaigns less than once per month. Instead of recurring charges, you buy credits for the number of emails you need to send. Pay As You Go offers more features than [..]

The typical technique for financing social security.

A prepaid alternative to buying internet service (instead of a monthly plan).

 Essentially another term for pre-paid, meaning service that is paid in advance, as-needed, instead of billed at the end of each month (post-paid). Since service is paid for in advance, there is no generally no need for contracts or credit checks with pay-as-you-go.   

Pay As You Go (PAYG) is a utility computing billing method that is implemented in cloud computing and geared toward organizations and end users. A PAYG user is billed for procured, rather than actual, [..]

This is a prepaid mobile phone service. It works by allowing customers to purchase credit in advance to make calls and send messages at rates set by the network.